Get Tronsmart Presto 10400mAh USB-C/Type-C Portable Power Bank with Quick Charge 3.0 (Black) from Amazon.com (via GeekBuying).
Price:   $25.99
Discount:   $5.00 via coupon "D8SB9EGJ"
Shipping:   Free for Amazon Prime members (or with $49+ Purchase)
Final Price:  $25.99 - $5 = $20.99 + Free Shipping with Amazon Prime
Free Amazon Prime: 30 Days (anyone), 30 Days (Mom), 6 Months (Student).

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