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 $25+ Purchase)
Final Price:  $25.99 - $5 = $20.99 + Free Shipping with Amazon Prime
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Specifications

Brand: Tronsmart
Model: Presto
Power Capacity(NUMBER): 10400mAh
Number of USB Ports: 2
Charging Connection: USB Type-C
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