As one of its daily deals, Amazon offers the Evolution Robotics Mint Automatic Hard Floor Cleaner, model no. 4200, for $149 with free shipping. That's the lowest total price we could find by $31. This compact robot floor cleaner runs on two C batteries (included) for up to three hours on a single charge. It includes two dry sweeping microfiber cloths and one wet mopping microfiber cloth. Deal ends today.