Buy.com offers the Audiovox XpressRCi Portable XM Satellite Radio Receiver, model no. XDRC2V1, for $99.99. With activation of a Sirius XM satellite radio subscription, this $50 mail-in rebate cuts it to $49.99. With free shipping, it's the lowest total price we've seen for a portable XM Radio receiver. (It's a current price low for this model by $31.) This XM satellite radio features an LCD color display, 60-minute pause, play, and rewind, dock installation kit, PowerConnect, and more. Deal ends September 30. Note that you must keep your subscription for at least 60 days before your rebate will be processed.