ErligpowhtDirect via Amazon offers Prime members the Erligpowht 300ml Essential Oil Diffuser in Red for $16.99. Coupon code "ERYZ3HNR" cuts it to $9.99. With free shipping, that's a buck under our mention from three weeks ago, $7 off, and the best price we've seen. It features four time settings with up to six hours of continuous operation, seven changing mood lights, and auto shutoff. Deal ends May 30.