Lepow Official via Amazon offers Prime members the Lepow Moonstone 6,000mAh External Battery Pack in Apple Green, model no. L-MS6000-AppleGreen-US-01-FBA, for $24.99. Coupon code "G6CC6FC7" cuts it to $15.99. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to qualify; otherwise, it adds $5.55.) That's $3 under our mention from two weeks ago and the lowest total price we've seen. (It's a current low by $44.) It features two USB ports and is compatible with most smartphones and tablets.