Sunvalley Brands via Amazon offers the TaoTronics 2.5-Liter Cool Mist Ultrasonic Humidifier for $29.99. Coupon code "DLNW8X3C" cuts it to $24.99. With free shipping, that's $5 off and the lowest price we could find. It features high and low mist modes and an LED indicator. Deal ends February 15.

Update: The coupon has expired; however the price has dropped to $19.99.