$30 is a lot for a trade-in, especially from gamestop.
So true, most of the time its 5-10$ with used games still selling $40-$50 so gamestop sacrificed alot more than they usually do. I never use gamespot though anyway, as big a rip off as selling something at a pawn shop might as well sell it yourself seeing as skyrim is a popular game and is not an exclusive market like collectibles to a pawn shop. Gamespot stores are a total rip off for trade-ins like almost every other vendor.