Amazon offers the Hamilton Beach TrueAir Air Purifier for $39.44 with free shipping. That's tied with last week's mention and the lowest price we could find now by $16. It's effective for 140-square-foot rooms and can be positioned horizontally or vertically. It features three speeds, one permanent, 99% HEPA-grade filter, and two replaceable carbon zeolite filters (for eliminating pet odors).