Evolution Robotics 4200 Automatic Hard Floor Cleaner for $161.20 shipped. Here is a screenshot for your reference. Alternatively, it is available at Walmart for $166.54 with in-store pickup. This robot floor cleaner runs up to 3 hours on single charge using microfiber cloths, features Northe Star Navigation System guidance to methodically clean open areas, around furniture and rugs, and along room perimeter and quiet operation, and turns itself off when finished. Most places have it for about $199.