Game Crazy is running a deal where you trade in any 3 games, you net an extra 30% trade credit for all of them. It runs until 9/14. One downside is it can't be combined with the MVP, but you'll net an extra 9 bucks a game if it trades in for $30. :D According to the paperwork, it works on all...
I think if you can find a 20GB model at Game Crazy, they retail for $249.99 new. I did a swap for a defective for a customer, and it was priced that. So, if you wanna save ten bucks or so on a 20, Game Crazy might not be a bad idea.