Target via eBay offers the TomTom 4.3" Rider Motorcycle GPS Navigator, model no. 1GD005200, for the in-cart price of $209.98 with free shipping. (Amazon has it for the same price with free shipping.) That's the lowest total price we could find by $91. It features a glove-friendly waterproof 480x272 touchscreen, free lifetime maps, Bluetooth, and a vehicle mount.