Walmart offers the Neato All-Floor Robotic Vacuum System, model no. XV-12, with the Neato XV Series Pet and Allergy Replacement Filter 2-Pack, model no. 900-0080, for $249 with free shipping. That's $1 under our October mention (without the bonus filters) and the lowest total price we could find by $45. This system works on most floors and features a laser-based Room Positioning System that allows it to avoid obstacles while vacuuming a room.