Best Buy Gaming mobile app. The latest version has added a new trade-in valuator, which allows you to learn how many bucks a given game will fetch at your nearest Best Buy. You can even find a game's value by scanning its barcode with your device's camera. Frankly, even if you're not looking to pawn your old junk for the new hotness, there's no denying that it's just fun to scan things.
The Best Buy Gaming app is available for free on iOS, Android and Blackberry.