Buy Happier via Buy.com offers the factory-refurbished iRobot Roomba 560 Robotic Vacuum Cleaner, model no. 72-94560 , for $249 with free shipping. That's $27 under our October mention of a new unit and the lowest total price we could find for a refurb by a buck. (It's currently $97 under the best deal we could find for a new model.) The Roomba 560 includes a charger, two virtual wall lighthouses, and brush cleaning tool. Other features include dirt sensors and on-board scheduling, which provides up to seven automated cleaning times per week. A 1-year iRobot warranty is supplied.