AnkerDirect via Amazon offers the Anker Astro 3E 10,000mAh External Battery Power Bank, model no. AK-79ANS1052-BA, for $36.99. Coupon code "EV8R3TKE" drops it to $33.29. With free shipping, that's the lowest total price we could find by $7. It features status LED lights, lithium-ion battery, connective adapters, and USB cable.