AnkerDirect via Amazon offers Prime members the 2nd generation Anker Astro E4 13,000mAh External Battery Power Bank
in Black, model no. AK-79AN13K2-BA, for $29.99
with free shipping
. (Non-Prime members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $6.98.) That's $14 under our February mention of the previous edition of this power bank and $10 below the lowest total price we could find for the previous edition now. It features dual USB ports for simultaneously charging two devices, four status LED lights, flashlight, lithium-ion battery, connective adapters, and micro USB cable.
Note that it's currently on backorder with an expected ship date of August 18.