ErligpowhtDirect via Amazon offers Prime members the Erligpowht 300ml Essential Oil Diffuser for $19.99. Coupon code "XQ48FQSI" cuts it to $10.49. With free shipping, that's a buck under last week's mention, $10 off, and the lowest price we could find. It features four time settings with up to six hours of continuous operation, seven changing mood lights, and auto shutoff. Deal ends May 1.