Groupon offers the factory-refurbished iRobot Roomba 650 Robotic Vacuum Cleaner, model no. R650020, for $279.99. Coupon code "VISA5" cuts it to $265.99. With free shipping, that's $54 under our June mention of a new unit, which was bundled with a $50 Best Buy gift card and a replenishment kit, and the lowest outright price we've seen for this vacuum in any condition. (It's a current best by $14.) It features a 3-stage cleaning system, virtual wall, object avoidance, 10-1/2" cleaning path, and on-board scheduling. A 90-day iRobot warranty applies. Deal ends August 30.