Here is one I started up with a little while ago. It's a little different because it really focusses on wargames. You might find it useful, or not, but at least it's an alternative to some of those one day cookie companies.

The commission varies on quantity of sales, from 8%-12%, and I believe the cookie duration is 90 days - you might want to check that out just to make sure, but I remember being pleasantly surprised.

For the spam conscious, here's the url:
Shrapnel Games

For those who want to help feed me:
Shrapnel Games

Anyways, they look like they have a decent program, and a variety of banners, check 'em out.