Yesterday I made double the trade-in value of four DS games after I traded them in at my local GameStop. They had a trade-in two, get $10 more credit. Or in my case, $20 for four games. I traded in Phoenix Wright: Ace Attorney, which I had beaten at summer camp; Metroid Prime: Hunters, which I found to be extremely difficult and frustrating; Meteos, which I had beaten about five times; and Sonic Rush, which I had beaten at summer camp. I also used my edge card to get $5 more credit. My grand total was a whopping $50, which is pretty good considering how old and unvaluable some of the games were. Without the extra credit, I would have only gotten $25.