Housmile via Amazon offers the Housmile 20-oz. Essential Oil Diffuser Ultrasonic Cool Mist Humidifier for $32.99. Coupon code "M5AIEACG" cuts it to $19.79. With free shipping, that's the lowest price we could find by $19. It works as an aromatherapy diffuser, humidifier, and night light. Deal ends December 16.