Erligpowht Direct via Amazon offers this 500ml Wood Grain Essential Oil Diffuser for $24.99. Coupon code "RRPX4G93" cuts it to $14.99. Plus, Prime members bag free shipping. That's $10 off list and the lowest price we could find. It features up to 18 hours of continuous use, a timer, auto shutoff, and seven changing mood lights. Deal ends April 30.