Walmart offers the Sunbeam Warm Mist Humidifier in Black, model no. SWM6000-BWM-115, for $19.96. Opt for in-store pickup to dodge the $5.97 shipping charge. That's the lowest price we could find by $29. It runs for up to 24 hours and features two speeds, 0.9-gallon tank capacity, and medicine tray.