Get Unifun 20,000mAh Dual USB 2-amp Power Bank from Amazon.com (via Unifun).
Price:   $19.99 (Reg: $49.99)
Discount:   $5.00 via coupon "MKUQLYLJ"
Shipping:   Free for Amazon Prime members (or with $25+ Purchase)
Final Price:  $19.99 - $5 = $14.99 + Free Shipping with Amazon Prime
Free Amazon Prime: 30 Days (anyone), 30 Days (Mom), 6 Months (Student).

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