AnkerDirect via Amazon offers the Anker Astro E4 13,000mAh External Battery Power Bank in Black, model no. AK-79AN13K-BA, or White, model no. AK-79AN13K-WA, for $43.99. Coupon code "BDDL6ZN9" cuts it to $36.99. With free shipping, that's $2 under last month's mention and the best price we've seen. It features dual USB ports for simultaneously charging two devices, four status LED lights, flashlight, lithium-ion battery, connective adapters, and USB cable.