Newegg offers the factory-refurbished Neato All-Floor Pet / Allergy Robotic Vacuum System, model no. XV-21, for $144 with free shipping. That's the lowest total price we could find for a refurb by $46, although we saw one for $25 less last week. This system works on most floors and features laser-based obstacle avoidance, a 6-foot boundary marker, two brushes, and a filter that purportedly retains more than three times the amount of fine dust particles. A 90-day Neato warranty applies.