For a limited time Staples is selling the Hoover Air Purifier 100 (WH10600) for a low $49.99 + Free Shipping. This is about $70 off the list price, and the lowest price we could find by far.

The purifier features an automatic timer shut off allows filter to run up to 8 hours, rinsable filter for lint, pet hair, etc., and an adjustable 3-speed fan.