Housmile via Amazon offers its Housmile 200ml Ultrasonic Aromotherapy Essential Oil Diffuser for $24.99. Coupon code "933DTVUW" drops that to $11.75. Plus, Prime members receive free shipping. That's $28 off list and the lowest price we could find. It features adjustable mist modes, waterless auto shut-off, seven LED night light colors. Deal ends October 31.