Leknesdirect via Amazon offers its Leknes LED Essential Oil Aroma Diffuser / Cool Mist Humidifier 2-Pack for $22.99. Coupon code "MK4TRQVD" cuts that to $10.99. Plus, Prime members receive free shipping. That's $2 under yesterday's mention of two similar diffusers, $12 off, and the lowest price we could find. It features seven LED colors with adjustable brightness. Deal ends April 30.