Woot offers iRobot Roomba Vac Robot Vacuum for $89.99 (reg. $249.99) free shipping with Prime. 

Product Description:
With the Roomba® Vac Essential robot, cleaning floors is simple. Simply use the iRobot Home App or press the clean button and let it get to work. This high-tech yet uncomplicated robot has the essential features people love with powerful suction for a deep clean. And it has a low-profile design, so it can grab dirt and dust from hard-to-reach places, like under the couch. It has smart navigation and an Edge-Sweeping Brush, so sensors help it navigate around furniture and avoid falling down stairs while it meticulously cleans your floors, including corners and edges.