As for specific store preferences...
I only buy stuff from GS or EB when it strikes my fancy, or if it's a real niche title that I want to pre-order and encourage (i.e. Phoenix Wright, Lost in Blue 2, etc.).
Other than that, I do most of my game purchasing online through amazon.com... and I do this through the affiliate program that Amazon.com runs with smaller sites. For example, anyone remember segagamer12? His site, ratscollectibles.com has amazon banner ads. I simply click there so that Amazon knows I came from his site, do some purchasing, and if everything works correctly he gets a tiny tiny tiny infinitesimal kickback. I also order amazon through codenamerevolution.com's affiliate program with banner and stuff.
*shrug* Sure, he probably gets quarters on the $50 dollar game, but it's better than nothing right? There's really no downside to this: I avoid GS/EB, I don't need to drive out to a store, I can have it mailed right to me, I have a HUGE selection, I can buy cds and movies as well, AND I'm doing a little to help small sites without paying any more than I'd normally pay.
~Carmine "Cai" M. Red
Kairon@aol.com