Walmart offers the Honeywell True HEPA Air Purifier in White, model no. 50250-S, for $120.84 with free shipping. (Amazon charges the same price.) That's the lowest total price we could find by $29, although we saw it for $22 less in August. Designed for rooms up to 390 square feet, it features a true HEPA filter, three cleaning levels, and 360-degree air intake.