Ebay offers Open-Box Dyson HP10 Purifier Hot+Cool Air Purifier for $299.99 (reg $529.99) with free shipping.

Product Description:
The Dyson Purifier Hot+Cool™ Gen1 purifying fan automatically senses, captures and traps pollutants to purify your whole room.¹ It heats or cools the air, while removing 99.97% of particles as small as 0.3 microns.³ ¹Tested In maximum setting for air projection, tested in Auto mode for purification coverage, tested for room heating per relevant Dyson method DTM961. ²Particle challenge by DEHS oil specified in EN1822 within a chamber specified in ASTM F3150. Tested in Max Mode for whole machine efficiency above 99.95%. Gas capture rates vary. ³Tested per ISO 29463.