Amazon offers the Winix Ultimate Pet PlasmaWave True HEPA Air Cleaner for $211.14 with free shipping. (Home Depot has it for the same.) That's the lowest price we could find by $46. It features three smart sensors, four fan settings, and PlasmaWave technology.

Update: The price has dropped to $208.42.

Update 2: The price has increased at Amazon; however, Home Depot still offers it for the same price.