Better Choice Online via Amazon offers the RolliBot 3D Laser Mapping Lasereye Robot Vacuum for $249.99 with free shipping. (Zake via Newegg offers it for the same price.) That's $50 under our October mention and the lowest price we could find now by $150. It actively maps space and pinpoints locations to avoid obstacles in real time, and features a 11.8 oz. dustbin and dual bristles.

Update: The price has increased at Better Choice Online via Amazon; however, Zake via Newegg still offers it for the same price.