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
[img]http://img118.imageshack.us/img118/8018/83767809.jpg[/img]
(fantasy characters - animals - monters) -
http://3dbud.com

3drt.com
[img]http://3drt.com/3dm/characters/real-zombies/characters-real-zombies-3d_01.jpg[/img]
(fantasy - scifi characters - animals - monters)
http://3drt.com

adenfall.com
[img]http://www.adenfall.com/modelalbum1/bedroom_render.jpg[/img]
(game objects)
http://adenfall.com

arteria-gaming.com
[img]http://www.arteria-gaming.com/fantheme/fanthemelogo.jpg[/img]
(game objects)
http://arteria-gaming.com

cubixstudio.com
[img]http://www.cubixstudio.com/products/FemaleNPC/FemaleNPC_CloseUp.jpg[/img]
(fantasy - scifi characters)
http://cubixstudio.com

dexsoft-games.com
[img]http://www.dexsoft-games.com/textures/images/fantasy/dungeon_tomb/tomb_banner3.jpg[/img]
(game objects - fantasy - scifi characters)
http://dexsoft-games.com

frogames.net
[img]http://www.frogames.net/frogames_images/bandeau_2.jpg[/img]
(game objects - fantasy - scifi characters)
http://frogames.net

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

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