Ritz Camera via eBay offers the Winix 4-Stage True HEPA Air Cleaner for $89.99 with free shipping. That's $70 under the best price we could find for a refurb (this one is new), although we saw a refurb for $5 less in December. It features 4-stage filtration, an air quality sensor, four fan speeds, PlasmaWave technology, and clean air delivery rate of up to 350 square feet.