Housmile via Amazon offers its Housmile 600ml Essential Oil Diffuser and Humidifier in Brown for $24.99. Coupon code "24J7WCLB" cuts that to $19.99. Plus, Prime members bag free shipping. That's $5 off and the lowest price we could find. It features 360° top cover rotation, and up to eight hours of continuous runtime. Deal ends February 28.