how much do i get for selling my used ps3 at gamestop?
i have:
1. 2 dualshock 3 controllers
2 80GB HDD
3.12 GAMES
LIST OF GAMES:
GTA IV
FIFA08
SOCOM CONFRONTATION
MERCENARIES 2 :WORLD IN FLAMES
FIGHT NIGHT ROUND 3
MLB 08
ASSASINS CREED
METAL GEAR SOLID 4
LEGO BATMAN
LEGO STAR WARS:THE COMPLETE SAGA
SKATE
ROCK BAND 2 WITH GUITAR AND MIC (MY DRUMSARE BROKEN :S )
The real question is why are you handing it in? Anyways you will get around $100 for the playstation alone or more depending on the condition, games will get you around 75 dollars but depends on the deals at the time. Hope this helps, and you hurt my feelings your selling ur playstation. 
PS3 Slim Hard Drive (HDD) Upgrade Tutorial