The Dyson HP01 Pure Hot and Cool Air Purifier Heater and Fan with HEPA drops from $499.99 to $409.99 with free shipping at HSN. As a bonus, it comes with an extra HEPA filter. Dyson's official store has this heater fan on sale for $399.99. However, this is the better deal, since you'll be getting an extra filter for just $10. Normally, these filters are $69.99. Aside from Dyson, every other store has this fan listed for its full price.