New price low! Woot! has the Instant Brand HEPA Quiet Air Purifier (Small) with Plasma Ion Technology for Rooms up to 630 Square Feet for $32 - 20% off with coupon code SAVE20 [Exp 10/9] =  $26 with free shipping for Amazon Prime members or $6 shipping. Exchanges air in 126 sq ft room five times per hour.