Amazon has the 250ml USB Cool Mist Humidifier sale for only $8.99 (regular price: $12.99) when you use promo code: VAAC8E6Y at checkout.
Free shipping on orders over $25 or free shipping with Amazon Prime.
• Powered by USB Cable:compatible with computers, laptops, portable chargers and other devices with USB output.
• 3 in 1 FUNCTIONS: Mist Diffuser, Humidifier, Night Light. PLEASE clean it at least once a week. Note: Please don't add essential oil into water for humidifier longevity
• Portable Designed to be comfortable to carry with no square edges
• 250ML Capacity: It can run up to 7 hours of continuous output. Automatic power off when water used up, which ensures safety.