BuyDig via eBay offers the Garmin Zumo 665LM GPS Motorcycle Navigator with XM Receiver, model no. 010-00727-08, for the in-cart price of $329 with free shipping. That's the lowest total price we could find by $127. This GPS system features a 4.3" 480x272 touchscreen LCD, XM Satellite Radio, traffic, and weather radar display, lifetime map updates, Bluetooth, and microSD slot.