Top Gainers and Decliners: Week of 1/14/2010

Top Percentage Gainers	Top Percentage Decliners
Top Dollar Gainers	Top Dollar Decliners

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Top Percentage Gainers

Title	#	Old	New	Chg $	Chg %	Notes
Captain America (1st Series)	241-2	$0.40	$3.75	$3.35	837.50
Sgt. Rock	410	$3.25	$8.50	$5.25	161.54
Escape from Wonderland	2/B	$3.25	$8.00	$4.75	146.15	Cover B by Rich Bonk
Archie’s Pals ’n Gals	71	$5.00	$10.00	$5.00	100.00
Archie	196	$12.50	$25.00	$12.50	100.00
Ultimate Armor Wars	1/A	$3.99	$7.00	$3.01	75.44
Ride, The	1	$2.75	$4.75	$2.00	72.73
Archie’s Jokebook Magazine	153	$11.50	$19.00	$7.50	65.22
Astonishing X-Men (3rd Series)	32/A	$2.99	$4.75	$1.76	58.86	Superhero Squad variant
Archie	165	$11.50	$18.00	$6.50	56.52
Batman Strikes, The	35	$6.50	$10.00	$3.50	53.85
Batman: Gotham Adventures	43	$6.50	$10.00	$3.50	53.85
Hulk	1/A	$15.00	$23.00	$8.00	53.33	Sunburst cover
Looney Tunes and Merrie Melodies Comics	241	$17.00	$26.00	$9.00	52.94
Sweethearts (Vol. 2)	97	$23.00	$35.00	$12.00	52.17
Spider-Man and the Incredible Hulk	1/B	$22.00	$33.00	$11.00	50.00	NN; Chaos in Kansas City giveaway; Denver Post giveaway
Dark Days	1/A	$5.00	$7.50	$2.50	50.00	Signed Variant Cover signed by Steve Niles and Ben Templesmith
Tenth, The (4th Series)	3/A	$7.00	$10.50	$3.50	50.00	Woman in open robe, underwear, tied with chains
Animaniacs: Welcome to Emergency World	1	$3.00	$4.50	$1.50	50.00	NN; American Red Cross promotion; ca. 1995
Punisher (5th Series)	1/DF	$29.00	$43.00	$14.00	48.28	Dynamic Forces Exclusive Chrome Cover
Sweethearts (Vol. 2)	95	$27.00	$40.00	$13.00	48.15
Richie Rich Vaults of Mystery	45	$4.75	$7.00	$2.25	47.37	Irona
Goon Color Special, The	1	$8.50	$12.50	$4.00	47.06
Dark Reign: The List—Punisher	1	$8.50	$12.50	$4.00	47.06	Dark Reign tie-in; Includes preview Punisher: Franken-Castle #1
Batman Adventures (2nd Series)	3	$5.50	$8.00	$2.50	45.45
Avengers (Vol. 3)	12/B	$12.50	$18.00	$5.50	44.00	Continued from Thunderbolts #22; Headshot cover (white background)
Batman Adventures, The: Mad Love	1-3	$16.00	$23.00	$7.00	43.75	3rd printing; NN; Origin of Harley Quinn; Prestige format
Incredible Hulk, The	-1/A	$5.25	$7.50	$2.25	42.86	Flashback
Trouble With Girls, The (Vol. 1)	10	$1.95	$2.75	$0.80	41.03	b&w
Goon, The (Albatross)	4	$10.00	$14.00	$4.00	40.00
Marvelous Land of Oz, The	1/A	$3.99	$5.50	$1.51	37.84
New-Gen	1	$2.00	$2.75	$0.75	37.50
Monster Hunters	18	$16.00	$22.00	$6.00	37.50	Final Issue
Mr. Hero-The Newmatic Man (Neil Gaiman’s…, 1st Series)	10	$1.10	$1.50	$0.40	36.36
Goon, The (Albatross)	1	$20.00	$27.00	$7.00	35.00	ca. 2002
Amazing World of DC Comics	12	$40.00	$54.00	$14.00	35.00
Alvin	22	$24.00	$32.00	$8.00	33.33
Gears of War	1	$2.25	$3.00	$0.75	33.33
Batman Strikes, The	41	$3.75	$5.00	$1.25	33.33
Bongo Comics Free-For-All!	FCBD 2008	$1.50	$2.00	$0.50	33.33	Free Comic Book Day 2008 giveaway; Digest sized
Incredible Hulk, The	1/B	$1.50	$2.00	$0.50	33.33	Wal-Mart Edition; Reprints The Incredible Hulk #1; Indicia says “Hulk Vol. 1 No. 1”
Owly & Friends	FCBD 2009	$2.25	$3.00	$0.75	33.33	Free Comic Book Day 2009
Invincible Iron Man	20/B	$3.99	$5.25	$1.26	31.58	70th Anniversary Cover
Days Missing	4/B	$3.99	$5.25	$1.26	31.58	Cover B by Frazer Irving
X-Men (2nd Series)	-1/A	$8.00	$10.50	$2.50	31.25	Variant cover, Flashback
Teenage Mutant Ninja Turtles Authorized Martial Arts Training Manual	6	$6.50	$8.50	$2.00	30.77
Wolverine: Danger on the Docks	2	$5.00	$6.50	$1.50	30.00	Drake’s Snack Cakes mini-comic giveaway; Continues from The Amazing Spider-Man: Carnage on Campus #1 and continues in The Incredible Hulk: Mayhem at the Mount #3; ca. 1993
Mike Danger (Mickey Spillane’s…, Vol. 1)	3	$1.50	$1.95	$0.45	30.00
Archie	466	$2.50	$3.25	$0.75	30.00
Sensational Spider-Man, The (2nd Series)	25/A	$5.00	$6.50	$1.50	30.00	Wanted poster cover

Top Dollar Gainers

Title	#	Old	New	Chg $	Chg %	Notes
Justice League of America	1	$7,700.00	$8,500.00	$800.00	10.39	1st Appearance of Despero; Origin of Despero
Journey into Mystery (1st Series)	83	$6,700.00	$7,100.00	$400.00	5.97	1st Appearance of Thor; 1st appearance Dr. Donald Blake; 1st appearance Stone Men from Saturn; Origin of Thor
Donald Duck (Walt Disney’s…, Linen Edition)	1	$3,200.00	$3,500.00	$300.00	9.38	First book devoted to Donald Duck; ca. 1935
Boy Commandos (1st Series)	1	$5,100.00	$5,300.00	$200.00	3.92	1st Appearance of Agent Axis (Sigrid); Origin of Liberty Bell; Winter 1942; Crossover with Sandman and the Newsboy Legion
All-Star Comics	7	$3,100.00	$3,300.00	$200.00	6.45
Amazing Spider-Man, The	Anl 1	$1,700.00	$1,875.00	$175.00	10.29	Versus Sinister Six; Cover reads “King-Size Special”
Mystery in Space	53	$2,125.00	$2,300.00	$175.00	8.24	Adam Strange begins
Green Lantern (1st Series)	11	$2,375.00	$2,525.00	$150.00	6.32	Spring 1944; Hop Harrigan story
Fantastic Four (Vol. 1)	48	$875.00	$1,000.00	$125.00	14.29	1st Appearance of Galactus; 1st Appearance of Silver Surfer; 2nd Appearance of Maximus
Incredible Hulk, The	6	$2,725.00	$2,850.00	$125.00	4.59	1st Appearance of Metal Master; 1st appearance of Teen Brigade; Hulk continued in Tales to Astonish #60
Crime Smashers	2	$675.00	$775.00	$100.00	14.81
Amazing Spider-Man, The	4	$2,375.00	$2,475.00	$100.00	4.21	1st Appearance of Betty Brant; 1st Appearance of Sandman (Marvel); 1st appearance of Liz Allen; Origin of Sandman (Marvel)
Amazing Spider-Man, The	12	$1,075.00	$1,175.00	$100.00	9.30	Versus Doctor Octopus
Amazing Spider-Man, The	20	$925.00	$1,025.00	$100.00	10.81	1st Appearance of The Scorpion; Origin of The Scorpion
Atom, The	1	$1,300.00	$1,400.00	$100.00	7.69	1st Appearance of Plant Master (Jason Woodrue); Dave Cockrum L.O.C.
All-American Comics	55	$975.00	$1,075.00	$100.00	10.26
Brave and the Bold, The	29	$2,275.00	$2,375.00	$100.00	4.40	2nd Appearance of Justice League of America
Star Trek (1st Series)	1/A	$850.00	$950.00	$100.00	11.76	Front and back photo cover variant
Action Comics	52	$1,225.00	$1,300.00	$75.00	6.12	1st appearance of Americommando (Tex Thompson)
Popular Comics	4	$1,175.00	$1,250.00	$75.00	6.38
Batman	49	$1,800.00	$1,875.00	$75.00	4.17	1st Appearance of Mad Hatter I (Jervis Tetch); 1st appearance of Vicki Vale
Amazing Spider-Man, The	19	$725.00	$800.00	$75.00	10.34	1st Appearance of Mac Gargan; 1st appearance of Rock Gimpy; 1st appearance of Ned Leeds; Versus Sandman (William Baker); Versus Enforcers
Strange Adventures	117	$1,025.00	$1,100.00	$75.00	7.32	1st Appearance of the Atomic Knights (Sgt Gardner Grayle; Wayne Hobard; Hollis Hobard; Bryndon Smith; Douglas Herald; Marene Herald); Atomic Knights reprinted in DC Super-Stars #2
Flash, The (1st Series)	123	$1,875.00	$1,950.00	$75.00	4.00
Wonder Woman (1st Series)	26	$800.00	$875.00	$75.00	9.38
Superman (1st Series)	31	$1,250.00	$1,325.00	$75.00	6.00
Adventure Comics	36	$1,825.00	$1,900.00	$75.00	4.11
Amazing Spider-Man, The	23	$480.00	$550.00	$70.00	14.58	Versus Green Goblin I (Norman Osborn)
Strange Adventures	59	$470.00	$530.00	$60.00	12.77
Strange Adventures	62	$460.00	$520.00	$60.00	13.04
Strange Adventures	60	$470.00	$530.00	$60.00	12.77
Strange Adventures	66	$460.00	$520.00	$60.00	13.04
Strange Adventures	67	$460.00	$520.00	$60.00	13.04
Captain Video	1	$590.00	$650.00	$60.00	10.17
Brave and the Bold, The	6	$725.00	$775.00	$50.00	6.90
Avengers, The	2	$1,075.00	$1,125.00	$50.00	4.65	1st Appearance of Space Phantom
Showcase	38	$700.00	$750.00	$50.00	7.14	2nd Appearance of Metal Men
All-Star Comics	33	$1,950.00	$2,000.00	$50.00	2.56	1st Appearance of Solomon Grundy
Green Lantern (2nd Series)	40	$725.00	$775.00	$50.00	6.90	1st Appearance of Krona; Origin of the Guardians
Crime Cases Comics	1	$400.00	$450.00	$50.00	12.50	#24 on cover
X-Men (1st series)	4	$1,050.00	$1,100.00	$50.00	4.76	1st Appearance of Brotherhood of Evil Mutants; 1st Appearance of Mastermind; 1st Appearance of Quicksilver; 1st Appearance of Scarlet Witch; 1st Appearance of Toad
Four Color Comics (2nd series)	79	$1,450.00	$1,500.00	$50.00	3.45	Mickey Mouse
Venom: Lethal Protector	1/A	$430.00	$480.00	$50.00	11.63	Origin of Venom; Black Cover printing error
Strange Adventures	52	$500.00	$550.00	$50.00	10.00
Green Lantern (2nd Series)	13	$530.00	$580.00	$50.00	9.43
Astonishing	28	$390.00	$440.00	$50.00	12.82
Tales From the Crypt (E.C.)	30	$650.00	$700.00	$50.00	7.69
Archie	30	$470.00	$520.00	$50.00	10.64
Iron Man (1st Series)	1	$650.00	$700.00	$50.00	7.69	1st Appearance Mordius; Origin of Iron Man; 1st Appearnace Mordius
Haunt of Fear, The (E.C.)	4	$1,025.00	$1,075.00	$50.00	4.88

Top Percentage Decliners

Title	#	Old	New	Chg $	Chg %	Notes
Project Superpowers	6/C	$17.00	$8.00	($9.00)	-52.94	Chase Cover
Hulk (4th Series)	4/B	$10.00	$5.25	($4.75)	-47.50	Red Hulk Cover; Diptch cover; Connects with Hulk (4th Series) #4/A
Beyond Wonderland	1/F	$36.00	$24.00	($12.00)	-33.33	J. Scott Campbell Museum Edition
Witchblade/Darkchylde	1/A	$0.60	$0.40	($0.20)	-33.33	Dynamc Forces edition
Stone Cold Steve Austin	1/B	$7.50	$5.25	($2.25)	-30.00	Signed photo cover
Superman (2nd Series)	47	$1.75	$1.25	($0.50)	-28.57	Versus Blaze; Soul Search - Chapter 2; Continued in Adventures of Superman #470
Superman (2nd Series)	7	$1.75	$1.25	($0.50)	-28.57	1st Appearance of Rampage (Kitty Faulkner); Origin of Rampage (Kitty Faulkner)
Superman: The Man of Steel	45	$1.75	$1.25	($0.50)	-28.57	[s]1995-21
Superman: The Man of Steel	63	$1.50	$1.10	($0.40)	-26.67	[s]1996-50; Lois rescues Clark from terrorists
From Hell	2-3	$2.00	$1.50	($0.50)	-25.00	3rd printing
Locke & Key	3	$2.00	$1.50	($0.50)	-25.00
Tales of the Unexpected	55	$55.00	$42.00	($13.00)	-23.64	Space Ranger cover; Includes 1-page Dr. Rocket humor feature; Includes Keep Learing PSA; Includes 1/2-page Professor Eureka humor feature
Green Lantern (3rd Series)	145	$4.25	$3.25	($1.00)	-23.53	1st Appearance of Ion
Legion, The	4	$4.25	$3.25	($1.00)	-23.53
Walt Disney’s Comics and Stories in Color	2	$8.50	$6.50	($2.00)	-23.53
Daredevil	502	$7.50	$5.75	($1.75)	-23.33
Medieval Lady Death	5/E	$3.25	$2.50	($0.75)	-23.08	No Pawn cover
Medieval Lady Death	5/G	$3.25	$2.50	($0.75)	-23.08	Hidden Power
Lady Death: The Wicked	0.5/M	$3.25	$2.50	($0.75)	-23.08	Size Doesn’t Matter
Darkchylde: Redemption	0.5/A	$4.50	$3.50	($1.00)	-22.22	Available through Wizard the Comics Magazine #111
Star Wars (Dark Horse)	1/A	$9.00	$7.00	($2.00)	-22.22	Dynamic Forces/AnotherUniverse.com exclusive; Chrome Edition signed by Anthony Wynn
CSI: Crime Scene Investigation—Dominos	4	$2.25	$1.75	($0.50)	-22.22
Executioner, The (Don Pendleton’s…)	4	$2.25	$1.75	($0.50)	-22.22
CSI: Crime Scene Investigation—Dominos	1	$2.25	$1.75	($0.50)	-22.22
CSI: Crime Scene Investigation—Dominos	3	$2.25	$1.75	($0.50)	-22.22
Doom Patrol, The (1st Series)	106	$92.00	$72.00	($20.00)	-21.74	Origin of Negative Man; Versus Mr. 103; Begins Origin of Negative Man serial
Marvel Comics Presents the X-Men	1	$3.50	$2.75	($0.75)	-21.43	Reprint from X-Men (1st Series) #53
Walking Dead, The (Image)	12	$3.75	$2.95	($0.80)	-21.33
Shock SuspenStories (E.C.)	12	$100.00	$79.00	($21.00)	-21.00	Includes anti-drug story: “The Monkey”
CSI: Crime Scene Investigation—Secret Identity	4	$2.50	$2.00	($0.50)	-20.00
Eagle (Viz)	2	$2.50	$2.00	($0.50)	-20.00	Scandal
Tales of the Teenage Mutant Ninja Turtles	6	$1.00	$0.80	($0.20)	-20.00
Groo The Wanderer (Sergio Aragonés’…)	4	$5.00	$4.00	($1.00)	-20.00
Eagle (Viz)	3	$2.50	$2.00	($0.50)	-20.00	The Vice-President
Ultraman (Nemesis)	3	$1.00	$0.80	($0.20)	-20.00
Nascar Adventures	3	$1.00	$0.80	($0.20)	-20.00	The Darlington Story.
Nascar Adventures	4	$1.00	$0.80	($0.20)	-20.00	Davey Allison.
Nascar Adventures	6	$1.00	$0.80	($0.20)	-20.00	David Pearson.
Bloodlines	7	$1.00	$0.80	($0.20)	-20.00
Angel (6th Series)	20/B	$2.50	$2.00	($0.50)	-20.00	Cover B by Nick Runge
Fathom: Dawn of War (Michael Turner’s…)	2/A	$3.75	$3.00	($0.75)	-20.00	Cover A by Talent Caldwell, Jason Gorder, & Peter Steigerwald
Pendragon (Aircel)	2	$1.50	$1.20	($0.30)	-20.00	Adult; B&W
Red Sonja (Dynamite)	19/B	$2.50	$2.00	($0.50)	-20.00	Cover B by Kevin Nowlan
Red Sonja (Dynamite)	20/A	$2.50	$2.00	($0.50)	-20.00	Cover A by Joe Prado
Star Wars Hasbro Expanded Universe Comic Two-Packs	6	$1.50	$1.20	($0.30)	-20.00	Painted cover; Redone cover; Reprints Star Wars: Republic #55; Giveaway; Packaged with Star Wars Hasbro Expanded Universe Comic Two-Packs action figures; 24 pages
Star Wars (Dark Horse)	1/B	$15.00	$12.00	($3.00)	-20.00	Dynamic Forces/AnotherUniverse.com exclusive; Chrome Edition signed by Ken Kelly
No Such Thing as Monsters	3	$1.00	$0.80	($0.20)	-20.00
No Such Thing as Monsters	4	$1.00	$0.80	($0.20)	-20.00
No Such Thing as Monsters	5	$1.00	$0.80	($0.20)	-20.00
No Such Thing as Monsters	6	$1.00	$0.80	($0.20)	-20.00

Top Dollar Decliners

Title	#	Old	New	Chg $	Chg %	Notes
Four Color Comics (2nd series)	62	$3,200.00	$3,000.00	($200.00)	-6.25	Donald Duck; 52 pages
Showcase	9	$6,900.00	$6,700.00	($200.00)	-2.90
Classics Illustrated (Gilberton)	2	$1,225.00	$1,075.00	($150.00)	-12.24
Four Color Comics (2nd series)	178	$2,950.00	$2,825.00	($125.00)	-4.24	1st Appearance of Uncle Scrooge; Donald Duck
Keen Detective Funnies (Vol. 2)	7	$1,175.00	$1,075.00	($100.00)	-8.51	1st appearance of The Masked Marvel
My Greatest Adventure	80	$725.00	$625.00	($100.00)	-13.79	1st appearance of The Doom Patrol (The Chief; 1st appearance of The Chief (Niles Caulder); 1st appearance of Elasti-Girl (Rita Farr); 1st appearance of Negative Man (Larry Trainor); 1st appearance of Robotman (Cliff Steele); 1st appearance of General Immortus; Origin of Elasti-Girl (Rita Farr); Origin of Negative Man (Larry Trainor); Origin of Robotman (Cliff Steele); Origin of The Doom Patrol
Justice League of America	2	$975.00	$900.00	($75.00)	-7.69	Jerry Bails L.O.C.
Amazing Spider-Man, The	11	$1,800.00	$1,725.00	($75.00)	-4.17	Death of Bennett Brant; 2nd Appearance of Doctor Octopus; Versus Doctor Octopus
Classics Illustrated (Gilberton)	26	$560.00	$500.00	($60.00)	-10.71
Amazing Spider-Man, The	16	$700.00	$650.00	($50.00)	-7.14	1st Appearance of Princess Python; 1st Appearance of The Great Gambonnos; Versus Ringmaster and Circus of Crime
Batman	24	$1,425.00	$1,375.00	($50.00)	-3.51
Classics Illustrated (Gilberton)	13	$825.00	$775.00	($50.00)	-6.06
Incredible Hulk, The	3	$1,775.00	$1,725.00	($50.00)	-2.82	1st appearance of Bruto the Strongman; 1st appearance of Cannonball; 1st appearance of Ringmaster; 1st appearance of Teena the Fat Lady; 1st appearance of The Clown; 1st appearance Circus of Crime; 1st appearance Aunt Polly; Origin of Hulk
Captain Flight Comics	9	$1,350.00	$1,300.00	($50.00)	-3.70
Classics Illustrated (Gilberton)	7	$650.00	$600.00	($50.00)	-7.69
Star Spangled Comics	65	$900.00	$850.00	($50.00)	-5.56	Robin stories begin; Robotman; Penniless Palmer; Star Spangled Kid; Liberty Belle
Classics Illustrated (Gilberton)	5	$950.00	$900.00	($50.00)	-5.26
Classics Illustrated (Gilberton)	12	$600.00	$560.00	($40.00)	-6.67
Classics Illustrated (Gilberton)	15	$390.00	$350.00	($40.00)	-10.26
Space Detective	1	$625.00	$590.00	($35.00)	-5.60
Comic Cavalcade	21	$560.00	$530.00	($30.00)	-5.36
Classics Illustrated (Gilberton)	11	$600.00	$570.00	($30.00)	-5.00
Four Color Comics (2nd series)	367	$490.00	$460.00	($30.00)	-6.12	Donald Duck
Justice League of America	4	$600.00	$570.00	($30.00)	-5.00	Roy Thomas L.O.C.
Captain America Comics	76	$1,500.00	$1,475.00	($25.00)	-1.67	Human Torch back-up
Four Color Comics (2nd series)	199	$975.00	$950.00	($25.00)	-2.56	Donald Duck
Batman	100	$2,150.00	$2,125.00	($25.00)	-1.16
Justice League of America	3	$850.00	$825.00	($25.00)	-2.94	1st Appearance of Hyathis; 1st appearance of Kanjar Ro; Origin of Kanjar Ro; Jerry Bails L.O.C.
Four Color Comics (2nd series)	422	$650.00	$625.00	($25.00)	-3.85	Donald Duck
Flash, The (1st Series)	108	$775.00	$750.00	($25.00)	-3.23
Batman	62	$1,425.00	$1,400.00	($25.00)	-1.75	Origin of Catwoman
Four Color Comics (2nd series)	223	$1,175.00	$1,150.00	($25.00)	-2.13	Famous Square Eggs story; Donald Duck Lost in the Andes
Four Color Comics (2nd series)	203	$900.00	$875.00	($25.00)	-2.78	Donald Duck; Mickey Mouse and Goofy
Four Color Comics (2nd series)	408	$650.00	$625.00	($25.00)	-3.85	Donald Duck
Aquaman (1st Series)	1	$800.00	$775.00	($25.00)	-3.12	1st Appearance of Quisp
Showcase	19	$1,425.00	$1,400.00	($25.00)	-1.75
Amazing Spider-Man, The	14	$1,525.00	$1,500.00	($25.00)	-1.64	1st Appearance of Green Goblin I (Norman Osborn)
Justice League of America	9	$875.00	$850.00	($25.00)	-2.86	Origin of Justice League of America
Batman	53	$775.00	$750.00	($25.00)	-3.23
Four Color Comics (2nd series)	238	$900.00	$875.00	($25.00)	-2.78	Donald Duck
Fantastic Four (Vol. 1)	Anl 1	$825.00	$800.00	($25.00)	-3.03	New material and reprints from Fantastic Four (Vol. 1) #1 and Amazing Spider-Man #1
Shock SuspenStories (E.C.)	12	$100.00	$79.00	($21.00)	-21.00	Includes anti-drug story: “The Monkey”
Doom Patrol, The (1st Series)	106	$92.00	$72.00	($20.00)	-21.74	Origin of Negative Man; Versus Mr. 103; Begins Origin of Negative Man serial
Dell Giants	26	$225.00	$205.00	($20.00)	-8.89	Walt Disney’s Christmas Parade
Weird Fantasy (E.C.)	4	$330.00	$310.00	($20.00)	-6.06	#16 on cover (1950)
Weird Fantasy (E.C.)	2	$380.00	$360.00	($20.00)	-5.26	#14 on cover (1950)
Adventure Comics	256	$590.00	$570.00	($20.00)	-3.39	Green Arrow
X-Men (1st series)	12	$440.00	$420.00	($20.00)	-4.55	1st appearance Juggernaut (Cain Marko); Origin of Juggernaut; Origin of Professor X
Brave and the Bold, The	43	$300.00	$280.00	($20.00)	-6.67	1st Appearance of Manhawks; Origin of Hawkman (Katar Hol)
Black Knight (Atlas)	5	$165.00	$145.00	($20.00)	-12.12	Dragon of Kentswood Swamp