[url=http://www.cheapassgamer.com/forums/cagomatic.php?do=tradein]Cheap Ass gamer's trade in value list (updated daily!)[/url]
You will, however, need to register to view the list though. Just found this tool helpful and thought that you guys needed to know about it.
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Gamestop sucks, trade-ins at Amazon.com are awesome, they gave me 210 for my Halo 4 Xbox while Gamestop would only give me 70.