Bestek via Amazon offers the Bestek Ultrasonic Aroma Diffuser Humidifier for $18.99. Coupon code NOB4237D drops it to $11.99. Plus, Prime members bag free shipping. (Non-members can spend $49 to bag free shipping; otherwise, it adds $5.70.) That's $10 off list and the lowest total price we could find. It features seven lighting options and two misting intervals.

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