Walmart offers the Honeywell True HEPA Air Purifier in Black, model no. 50255B, for $99 with free shipping. That's a buck under our mention from two weeks ago and the lowest total price we've seen. (It's also a current best by $36.) Designed for rooms up to 390 square feet, it features a true HEPA filter, three cleaning levels, and 360-degree air intake.