I got a 360 premium with two HDs, four wireless controllers, wireless net adapter and four games I didn't care about for $450 shipped. Sold off the games and two controllers (I barely play two player games, let alone four) and got $140 in GS store credit. So basically ended up with a 360 Premium + extra drive, two controllers and the wireless adapter for $300-there's definitely some good deals if you keep an eye out.
None of which helps you sell your console, I guess...