BetterBasics via Amazon offers the Sterline Essential Oil 300ml Diffuser/Humidifer for $19.99. Coupon code "AROMAS11" cuts it to $17.79. With free shipping for Prime members, that's $2 under our December mention, $2 off, and the best price we've seen. It features seven light colors, three timer settings, and auto shut off. Deal ends February 15.