It depends on who is offering the best deal. Sometimes I'll buy it from Best Buy, sometimes Gamestop is having a killer sale, or sometimes I just want to have a new game waiting for me in the mail when I get home from school/work along with the awesom pre-ordered art book.
I'm not that picky, but I do like doing my homework and scoping out which place is offering the best price before doing anything.
Playing: Hotline Miami, System Shock 2, GTA V, Siren Blood Curse, ICO/Shadow of the Colossus, Splinter Cell Blacklist PSN: T-Snake94, XBL: T-Snake 94
Most at Best Buy. As a part of the gamer club or whatever it's called, I can't pass up the $20 gift cards they give out with certain game purchases. Otherwise, it's usually Amazon for new, or GS for used.
A Jose Canseco Bat? Tell me...you didn't pay money for this. FFXIV - Attikus Finch - *Gilgamesh* - http://na.finalfantasyxiv.com/lodestone/character/1607973/