Woot offers Beefull W0568 10000mAh Portable Waist Fan for $9.97 (reg. $62.99) free shipping with Prime. 

Product Description:
Stay cool anywhere with Beefull Portable Waist Fan! Built-in 10000mAh battery supports up to 40 hours of runtime at low speed and doubles as a power bank to charge your devices. Features 100 adjustable wind speeds with a powerful 16000RPM motor for customized airflow. This versatile wearable fan can be clipped to your waist, hung around your neck, or placed on a desk. The included silicone cover offers extra protection, and the LED display keeps you informed. Perfect for outdoor activities, travel, or daily commutes!