As one of its daily deals, Amazon offers the iRobot Roomba 870 Robotic Vacuum, model no. R870020, for $449.99 with free shipping. That's tied with our April mention and the lowest total price we could find today by $149. It features 3-stage cleaning, a wireless command center, and two virtual walls. Deal ends today.

Update: Even better, Best Buy has it for $419.99 with free shipping.