Walmart has this Pureguardian 10-Hour Ultrasonic Humidifier on sale for $18.88 (reg. $39.99). Choose free store pick up or shipping is free on a $50+ purchase.
It uses Silver Clean technology to prevent the growth of mold and mildew on the tank which improves the performance. A single tank fill can run it for up to 10 hours at a time. It does not require filters, wicks or evaporating pads.
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