Gooloo via Amazon offers its Gooloo Ultrasonic Aromatherapy Essential Oil Diffuser / Humidifier in Brown or Reddish Brown for $29.99. Coupon code "OW7ISOUH" drops it to $21.89. With free shipping, that's $32 off and the lowest price we could find. It features BPA-free plastic construction, a 10.1-oz. water tank, 7-color cycling LED lights, 15 lighting modes, four timer settings, and waterless automatic shut-off.