Lepow Official via Amazon offers the Lepow Moonstone 6,000mAh External Battery in Glossy Black, model no. L-MS6000-Black-US-01-FBA, or Apple Green, model no. L-MS6000-AppleGreen-US-01-FBA, for $21.99. Apply coupon code "D6PPNAQ6" to cut the price to $17.99. Plus, Prime members receive free shipping. (Non-members can spend $35 or more to receive free shipping; otherwise, it adds around $5.37.) That's tied with our mention from two weeks ago and the lowest total price we could find by $42. It features two USB ports and is compatible with most smartphones and tablets.