As one of its daily deals, A4C offers the Motorola Atrix HD Car Dock, model no. 89581N, for $4.49 with free shipping. (Phone-Zone via Amazon has it for a few cents more.) That's the lowest total price we could find by a buck. Compatible with the Motorola Atrix HD model only, it enhances your phone's navigation functionality and allows you to quickly locate your parked car via Motorola's DriveSmart Smart Action and Car Finder apps. Deal ends October 26.