Oddly enough, my friend just got a 360 and wanted a 1-year code, so I sold him my spare one from the Buy.com sale (which was supposed to be a gift for another friend, haha, not anymore!); and found a DJ Hero kit on eBay for $75 shipped. Like new; with game and turntable.
That's $4 more then what the game alone went for the other day. I'm going to send my demo kit to another friend once I receive my new one (and -$30 my friend gave me for the XBL code, making it $45 in total out of pocket). Very fun game.