Dell has the Microsoft Xbox 360 Arcade Holiday Bundle (includes SEGA Superstars Tennis Game and 5 Xbox Live Arcade Games) for $169.99 when you use the 15% Off coupon: PWXNZVNDRWWX1P
You can also get the Microsoft Xbox 360 Pro Holiday Bundle (includes Kung Fu Panda and LEGO Indiana Jones Games along with a 60GB Hard-Drive) for $254.15 or the Microsoft Xbox 360 Elite Holiday Bundle (includes Kung Fu Panda and LEGO Indiana Jones Games along with a 120GB Hard-Drive) for $329.99 when you use the 15% Off coupon: PWXNZVNDRWWX1P
The coupon expires on October 29th or after 3000 uses, whichever comes first.
If it says that the console is out of stock, add it to your cart as you normally would and your console should ship when they are next available. With a hot item like the Xbox 360, Dell should be receiving shipments very often.