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AVID POWER [amazon.com] via Amazon has Portable Air Mattress Pump with 4000mAh Rechargeable Battery – $ 17.99 when you "clip" the $ 12 off coupon on the page.
AVID POWER Portable Air Mattress Pump with 4000mAh Rechargeable Battery – $17.99, Free Shipping with Prime orders $25+