$100 for the deck for you guys. It retails for $250 most places and is around $200 on eBay. It is a Sirius deck, but as Tyson said you can run XM and iPod as well through it using the AUX in.
There is also an iPod adapter for it if you want full control. $45 shipped from Cardomain.
http://www.cardomain.com/item/ECLIPC106