Best Buy offers the Crane Chip the Robot 1-Gallon Ultrasonic Cool Mist Humidifier, model no. EE-8253, for $28.99. Opt for in-store pickup to avoid the $7.99 shipping charge. That's the lowest price we could find by $21. It features a run time of up to 24 hours, auto-off function, and 1-gallon tank.