This deal has ended.
Amazon.com has the Delphi MyFi Portable XM satellite radio for just $101.99 after a $50 mail-in rebate. You can take this with you in the car and then unplug and take it into work. The MyFi can record and play back up to 5 hours of XM programming. Price does not include subscription to XM satellite radio ($12.95/month). Shipping is free.