Today I went searching for a mini USB fan that I could use while walking on the treadmill at the gym. Gold’s Gym’s new treadmills don’t have a fan at all and I get too hot to walk as far as I used to do. I tried at Office Depot, Best Buy and Walmart, none of whom had them in stock. I made one more stop at Bed, Bath and Beyond, where I hit the jackpot. I selected a Comfort Zone 4-inch dual power fan. It can be plugged directly into any powered USB port or it can be used with the included 120 V plug with a USB port.