If you have any spare games lying around and you dont want to get shafted my stupid trade in offers, try http://www.gameshare.co.uk
What you do is list your games in your profile and then make a "wanted" list and you will be able to make offers to other members on swaps!
Not just 360! PS3/Wii/ps2/pc/gamecube and more!!
YOU GET YOUR FIRST SWAP FREE!! Then after that its £5 for 10 swaps!!