Not wanting to get in trouble for "advertising", I will only state the facts of what happened to me at these two stores yesterday.
I had brought back to the mall 2 XBox game which I no longer play. These were Prisoner of War and Enter the Matrix. I went to EB first to sell them, they would give me 5$ store credit or 4$ cash for both. I wanted to use that money to reserve a game so I decided i'd try to sell them to Gamestop. At Gamestop the would give me 10$ store credit or 8$ in cash. You can guess which store I eventually sold them to.
Anyone have similar things happen?