If your in the habit of buying/selling used games at a Gamestop esq store STOP!!
Use this website instead, its sweet.
www.Playswitch.com
I bought Gears of war for 12 bucks and will sell soul caliber 4 for 40 (gamestop offered me 20)
The only catch is its only for game trading purpose. This is good cause it holds up the gurantee that you will be happy with the game sold to you or else the transaction will be reversed.
Check it out and you will save a lot of money on your gaming.
If you like what you see and wanna give me credit to signing up feel free to pm me and I will give you my email address.