As one of its daily deals, Best Buy via eBay offers the PureGuardian Elite 1.3-Gallon Ultrasonic Humidifier in Black Onyx, model no. H7560B, for $99.99 with free shipping. That's $50 off list and the lowest total price we could find. It features automatic humidity-level adjustments, 12-hour timer, and runs for up to 90 hours per 1.3-gallon tank. Deal ends today.