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>
3dbud - Real-time 3D models: 3D Characters 3D worlds 3D Demos
3drt.com

(fantasy - scifi characters - animals - monters) <new zombie pack>
3DRT - Real-time 3D models: 3D worlds 3D Demos
adenfall.com

(game objects)
Adenfall Software
arteria-gaming.com