There are quite a few, Gamefly, eDimensional, Play-Asia, Play-Asia has a very wide range of products but payouts are not exactly great and conversions are few and far between usually.
Heya, we just launched a new one - feel free to check out http://www.assasindiaries.com - aff button is on the bottom, if you'd like more info please let me know. Cheers, NC.
I disagree. I'm doing pretty well with Play-Asia, they're especially good if your audience is "adult" gamers (e.g over 5 years old) who are interested in imports and classic gaming (Neo-Geo, SNES, GP2X etc). www.play-asia.com @WiiWorld - they have a crap load of Wii stuff too