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Sunvalley Brands [amazon.com] via Amazon has RAVPower 26800 Power Bank 26800mAh on sale for $ 49.99 – $ 17 off w/ promotional code YB69X7C8 + $ 7 Clip Coupon on Amazon = $ 32.99
Shipping is free
RAVPower 26800mAh Portable Charger/Power Bank 5.5A Total Output 3-USB Port for (2.4A Input, iSmart 2.0 USB Power Pack) for $32.99 + Free Shipping