Microsoft is currently running a pretty good deal, if you buy an Xbox 360 Elite between now and October 5 you can get $50 back through a mail-in rebate. This puts the Xbox 360 at $250 (until October 5), which is pretty awesome. Unfortunately it’s through a mail-in rebate, which always seem to take forever to get back to you, but still worth it. The form is located here and must be mailed with proof of purchase before November 20.
Microsoft Offers $50 Rebate for 360 Elite