Wow! Head over to Walmart and get these Fresh Aire Personal Ultrasonic Humidifier priced at only $4.88 each! (Reg. $14.17) It looks like you can choose from the white or the black for that low price. These are designed to run up to 10 hours without a refill. Plus, choose in-store pickup to save on shipping. Or, shipping is FREE when you spend $35 or more.