Amazon: Taotronic Ultrasonic Humidifier Only $18.99
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This ultrasonic humidifier is totally silent which makes it great for the home or office. It features an extra-fine ceramic cartridge filter that will filter against germs, micro-organisms, and bad odor. The water tank holds 3.5 liters which will last up to 10 hours without a refill, and when it gets low, it automatically shuts off.