trading in games is a scam. have you noticed that every time you walk into a game store it's: "hey there, got any trade-ins?" "next time bring in your old games and systems"
you get so little return on your investment and they're making a killing off of them.
you know that they are just going to take the game you gave them and sell it for considerably more money than they gave you. dunno bout you, but that doesn't sit well with me.
while you may not think it's worth your time, ebay is the best way to go.
stop feeding their system!!!