Ebay offers Bissell Air400 Large Air Purifier with Premium HEPA Filtration Library Quiet CR for $149 (reg. $399.99) free shipping.

Product Description:
Clean air made easy. Introducing the BISSELL™ air400. A reliable, holistic approach to indoor air care. Designed for performance from the inside out. Equipped with 3-stages of filtration to capture airborne particles and odors, CirQulate™ System for set it and forget it convenience, and an Air Quality Feedback Indicator that numerically identifies your home’s air quality in real-time. It's clean air you can count on! It also has a large fan and digital 20,000-hour DC motor, that together exchange the air in a 400 sq. ft. room three times per hour when on max mode. Life happens - kids, pets, odors, allergens, dust, and beyond. Let us worry about cleaning the unseen while you rest assured that your family is breathing easy, clean air.