As one of its daily deals, Best Buy offers the Samsung PowerBot Cleaning Robot Vacuum in Airborne Copper, model no. VR20H9050W, for $499.99 with free shipping. That's $38 under our mention from last month and the best price we've seen. (It's also a current low by $10.) It features a 12.2" cleaning path, LED display, seven cleaning modes, auto docking, and 60 minutes of cleaning time per charge.