Replying to Wow, Gamestop, really?

Just called Gamestop to ask how much my Xbox 360 will be worth if I were to trade it in... The system, plus a 20 GB hard-drive, 2 controllers and a wireless adapter: $90. To me, that sounds kind of ridiculous. I was expecting at least $150-$200. I just want to get rid of it, cause I'm going in on the 14th to pick something else up. But should I try and find another way to sell it? Or just say fuck it? I mean, I bought it the day the Xbox 360 was released. Not really in the best condition anyways. Thoughts?