Air Purifiers on Sale

Dyson via eBay offers its refurbished Dyson HP01 Pure Hot + Cool Desk Purifier, Heater, and Fan in Iron/Silver for $169.99 with free shipping. That's $17 under last month's refurb mention and the best deal we've seen. (It's $193 under the lowest price for a new one.) It features a vacuum-sealed glass HEPA filter that removes 99.97% of allergens, 9-hour sleep timer, and magnetic remote control.

Note: A 6-month Dyson warranty applies.

Amazon offers the Awair Glow Air Quality Monitor for $99 with free shipping. That's the lowest price we could find by $35. It covers up to 1,000 square feet and tracks chemicals, carbon dioxide, humidity, and temperature.

Carephil via Amazon offers its Carephil Air Purifier for $129.99. Coupon code "50P9R94R" cuts that to $64.99. With free shipping, that's $65 off and the best price we could find. It features three fan speeds and 7-hour timer. Deal ends December 7.