Trading in games at GameStop has never been so sweet. Sometimes, GameStop would have you bring in 5-6 games to get an extra 40% in trade-in credit. But this latest deal is stupendous. GameStop has announced that from now until March 14, every game traded in will get you an extra 50% in trade-in credit. Best part is, this deal works if you want to just bring in one game or a whole shopping bag full (I hate those people, always make me wait on line for a long time).