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RAVPower Official via Amazon [amazon.com] has RAVPower Camera Battery Charger on sale for $ 13.99 and w/ Clip $ 5 Coupon for $ 8.99.
RAVPower Camera Battery Charger for GoPro Hero 6 Battery AHDBT-501 (2 Pack 1260mAh Replacement) $8.99 AC + FSSS