Get Jackery Giant S Premium 12000mAh Dual USB External Battery Pack, Power Bank from Amazon.com (via Jackery Inc).
Price:   $29.99 (Reg: $49.99)
Discount:   $13.00 via coupon "V4RNWTCN"
Shipping:   Free for Amazon Prime members (or with $25+ Purchase)
Final Price:  $29.99 - $13 = $16.99 + Free Shipping with Amazon Prime
Free Amazon Prime: 30 Days (anyone), 30 Days (Mom), 6 Months (Student).

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