Beehive via eBay offers the Sunbeam Cool Mist Humidifier in Black or White for $20.62 with free shipping. Outside of the seller below, that's the lowest price we could find by $13. It features a triple-layer filter enhanced with Arm & Hammer Baking Soda, filter check monitor, and compartment for aromatherapy tablets.

A close price, Walmart offers it in Black or White for $21.44 with in-store pickup