I'm making a list of game-ready model shops, if you know another ones please tell me ^^ here's what I've found so far:
(alphabetically sorted)

3dbud.com

(fantasy characters - animals - monters) - <they have just updated new monsters and characters>
http://3dbud.com

3drt.com

(fantasy - scifi characters - animals - monters) <new zombie pack>
http://3drt.com

adenfall.com

(game objects)
http://adenfall.com

arteria-gaming.com

(game objects)
http://arteria-gaming.com

cubixstudio.com
http://www.cubixstudio.com/products/...PC_CloseUp.jpg
(fantasy - scifi characters)
http://cubixstudio.com

dexsoft-games.com
http://www.dexsoft-games.com/texture...mb_banner3.jpg
(game objects - fantasy - scifi characters) <new cool fantasy characters>
http://dexsoft-games.com

frogames.net
http://www.frogames.net/frogames_images/bandeau_2.jpg
(game objects - fantasy - scifi characters) <mmorpg character pack>
http://frogames.net

gamebeep.com
http://img142.imageshack.us/img142/962/26031368.jpg
(game objects - fantasy - scifi characters)
http://gamebeep.com

game-stuff.com
http://www.game-stuff.com/architect/windmill_1/02.jpg
(game objects - game levels)
http://game-stuff.com