Walmart offers the Fresh Aire Personal Ultrasonic Humidifier in Black, Red, or White, model no. FALLH-01B, for $11.88. Opt for in-store pickup to dodge the $5.97 shipping charge. That's the lowest price we could find by $12, although we saw it for $2 less last June. It's designed to run 10 hours without a refill and features 1-button control and a night light.