This uNu Enerpak Tube Universal Battery Pack with Built-In Flashlight, listed at $59.95, is now $34 at Groupon Goods. Plus, shipping and returns are free. The best price we could find anywhere else is $50. It features a USB port for connecting iPhones, iPads, Android devices, tablets, cameras, and more. It adds up to three times as much battery life to your device, and there is an LED battery indicator. Sales tax is charged in most states.