Samsung 10000mAh Portable Battery: $15
Samsung.com has Samsung 10,000 mAh Portable Battery Pack w/ USB-C Cable (Silver) for $15. Free shipping.
Note: This Samsung portable charger features a 10,000 mAh capacity providing up to 2 full charges from 0-100% on most of the latest smartphones. Fast charge Galaxy S9, Note9 and more at up to 15W power output.