As one of its daily deals, Amazon offers Prime members the PNY L3000 3,000mAh 1-amp Portable Battery Charger, model no. P-B-3000-L-K01-RB, for $17.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, it adds $8.15.) That's the lowest total price we could find by $10 and a very strong price for a power bank with a built-in Lightning connector. It provides up to two charges for your device and features an Apple Lightning cable. Deal ends today.