Ebay offers Dyson TP4A Pure Cool™ tower purifier fan Certified - Refurbished for $169.99 (reg. $549.99) with free shipping. 

Product Description: 
The Dyson Pure Cool™ Cool Purifying Tower automatically removes 99.97% of allergens and pollutants as small as 0.3 microns from your home. Including pollen, bacteria and pet dander. Air Multiplier™ technology delivers over 77 gallons per second of smooth, yet powerful airflow – circulating purified air throughout the whole room.² The Dyson Pure Cool™ Purifying Tower purifier fan is wrapped with a 360°, vacuum-sealed Glass HEPA filter. A layer of activated carbon granules captures odors and harmful toxins like paint fumes. Purification all year round. Purifying fan in summer. Smooth, long-range air flow to cool you in summer. Night-time auto mode monitors, reacts and purifies, but only using the quietest settings. LED display dims – no disturbance. Low maintenance, easily changeable filters.