Walmart offers the Crane Drop Ultrasonic Cool Mist Humidifier in Green, Orange, White, or Grey for $29.88. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $5 under our March mention of another color and the lowest price we could find by $15. It features a 1-gallon capacity and 24-hour run time.

Update: Grey now drops to $29.35 with in-store pickup.