Amazon offers Prime members the Optimus 1.5-Gallon Cool Mist Ultrasonic Humidifier
, model no. U-31002, for
with free shipping
. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $9.50.) That's $2 under our mention from a month ago, the best deal currently by $6, and the lowest total price we've seen. It features a water empty automatic shut-off switch, refill light, and adjustable mist volume control.
The price has dropped slightly to $15.25