Amazon.com has several XM satellite radio receivers on sale with steep discounts. There are also rebates for some portable XM satellite devices like the Samsung Nexus 50, which sells after rebate for .

The Samsung YX-M1Z Helix sells for $78.95 right now. The list price is $349.99.

The Helix has a built-in MP3/WMA player and a XM satellite receiver. Other features include 1GB storage, 1.7 inch color screen and USB 2.0.
Other XM satellite devices on sale include the older Samsung Nexus 25, which only can receive XM satellite radio when docked, which sells after mail-in rebate for only $39.99.

Details about the rebate:
Get $50.00 from XM Satellite Radio when you buy a Pioneer Inno, Samsung Helix, Delphi SKYFi2, Delphi MyFi or Samsung neXus 25/50 and activate a new subscription with a credit card on that radio by 04/02/2007, and maintain uninterrupted service for at least six months with this mail-in rebate.
More details on Amazon.com.