Woot has Winix C545 4-Stage True HEPA Air Purifier w/ WiFi & PlasmaWave Technology (Factory Reconditioned) on sale for $64.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.

Product Details:

• Includes 1 True HEPA Filter and 4 Carbon Filters (Filters are brand new)
• Cleans rooms up to 1,740 sq ft in 1 hour (870 sq ft in 30 minutes, 580 sq ft in 20 minutes, 435 sq ft in 15 minutes)
• Control and monitor your unit anytime from anywhere by instantly accessing your unit with the Winix Smart App through the convenient Wifi feature
• Washable Fine Mesh Pre-Filter: The first line of defense against the largest airborne particles found indoors