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Sunvalleytek via Amazon [amazon.com] has RAVPower 20100mAh Quick Charge 3.0 Portable Battery Pack on sale for $ 49.99 – $ 14 w/ promotional code LJEFWHEK = $ 35.99. Shipping is free.
RAVPower 20100mAh QC 3.0 Type C Battery Pack $36 + Free Shipping