Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier for $22.97. Shipping is free on orders over $35. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for reference. It features a water empty automatic shut off switch and refill light, adjustable mist volume control, and 1.11-gallon tank capacity.
This deal has expired as the price has been raised. Congratulations to those able to get in on it.