Costco has the Homedics Total Comfort Ultrasonic 2 Gallon Humidifier with essential oils tray for $79! There are other ultrasonic humidifiers online: https://amzn.to/2DBDt9R .
With the variable mist adjustment, they claim it can run from 12 – 120 hours. The tray for essential oils is located on the rear back of the humidifier.
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