Oak Leaf via Amazon offers its Oak Leaf Ultrasonic Mini Air Humidifier with Soothing Color LED Lights for $22.99. Coupon code "HQ5NVILC" cuts that price to $16.99. Plus, Prime members bag free shipping. That's a buck under our Black Friday mention, $6 off, and the lowest price we could find. It features seven colors, 100ml tank, and two mist modes. Deal ends March 31.