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Walmart [walmart.com] has Liquipel Powertek 20,000 mAh Portable Charger Power Bank (Black) for $ 8.56. Shipping is free w/ Walmart+ (free trial available [walmart.com]) or on orders $ 35+.
Liquipel Powertek 20,000 mAh Portable Charger Power Bank (Black) $8.56 + Free S&H w/ Walmart+ or $35+