Amazon has the Breett 10000mAh Power Bank Dual-Port USB with a 2.1A 1.0A Portable External Battery Charger for only $14.99 (Free shipping with Prime). That’s 70% off the list price and the lowest we could find it for.
It has a powerful 10000mAh external mobile battery with high-speed 2.1A & 1.0A USB ports to charge two devices at once. It’s also equipped with 4 LED to display power to quickly and effectively solve the low power problem for you when you’re on the go.
Amazon shoppers gave it 4/5 stars and good reviews.