Housemile via Amazon offers its Housmile 1.8-Liter Essential Oil Diffuser Ultrasonic Cool Mist Aroma Humidifier for $25.99. Coupon code "2SL5H35D" cuts it to $16.89. With free shipping, that's the lowest price we could find by $14. It functions as an aromatherapy diffuser, humidifier, and night light, and features three mist modes, seven light colors, auto shutoff, and touch controls. Deal ends September 30.