Get Unifun 20000mah Dual USB External Battery Charger from Amazon.com (via Unifun).
Price:   $19.99 (Reg: $49.99)
Discount:   $3.00 via coupon "NXT8UB6R"
Shipping:   Free for Amazon Prime members (or with $25+ Purchase)
Final Price:  $19.99 - $3 = $16.99 + Free Shipping with Amazon Prime
Free Amazon Prime: 30 Days (anyone), 30 Days (Mom), 6 Months (Student).
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