Here's a good one to keep an eye out for as well
Hulk #271
Thank goodness I already have GOTG #1 1990 & 2008 books, I brought this
book to attention back in August here in the Junkie Forums. I've yet to score the Marvel Super Heroes #18 issue with the Guardians in it, it's already super expensive.
Keep your eyes out for these books as well, key roles in the movie could cause 1st appearances to "spike", many of which are now undervalued gems & can be had on the cheap:
Bug, aka, The Galactic Warrior, "Loverbug" 1st app: Micronauts #1
Cosmo, First Appearance Nova #8 (2008)
Drax the Destroyer: ANOTHER reason Iron Man #55 is KEY.
Groot: first appeared in Tales to Astonish vol. 1 #13 (November 1960)
Rocket Raccoon: First Appearance Marvel Preview #7 (1976)
Star-Lord: Marvel Preview #4 (Jan. 1976),
Jack Flag: 1st app: Captain America (1st series) #434 (1994)
Moondragon: (as Madame MacEvil) Iron Man #54
Gamora: Strange Tales #180 (June, 1975)
Mantis: Avengers (vol. 1) #112 (June 1973)
Major Victory Marvel Super-Heroes (1st series) #18 (January 1969)
Rocket Racoon's first comic appearance ( not magazine)
has been making waves on E bay in the $25 range as is Hulk #271