As one of its daily deals, Woot offers the factory-refurbished Blueair 450E Digital Air Purifier for $329.99 plus $5 for shipping. That's the lowest total price we could find for a refurb by $104, and it's $294 under the best price for a new unit. This air purifier features a Clean Air Delivery Rate of 240 cfm, progressive carbon filter, coverage up to 365-square feet, and remote control. A 1-year Blueair warranty applies. Deal ends today.