Sirius.com offers the XM Onyx Radio + 30 Days of XM Satellite Radio Service for free. Shipping adds $9.33, so this is a $84 savings on the normal price of the radio and a month of service. It lets you listen to unlimited commercial-free rock, pop, jazz, country, sports, news, and more while you drive. Note that you'll have to cancel your subscription within the 30 day trial to avoid being automatically enrolled and billed for paid service. Sales tax is charged in most states.