Walmart offers the Crane Ultrasonic 1-Gallon Cool Mist Humidifier in Duck or Gator for $26. (Amazon charges the same with free shipping for Prime members only.) Opt for site-to-store pickup to dodge the $4.97 shipping fee. That's tied with our February mention as the lowest price we've seen. (It's the best now by $5.) It features a run time of up to 24 hours, auto-off function, and 1-gallon tank.