Tonerone Direct via Amazon offers the Tonerone 13.5-oz. Ultrasonic Aromatherapy Essential Oil Diffuser and Cool Mist Humidifier in Black for $26.99. Coupon code "FKWSKYZN" cuts the price to $16.19. With free shipping, that's tied with our mention from last August and the lowest price we could find by $12. It features seven colored lights, a 10-hour runtime, and four timer and mist settings. Deal ends June 15.