Anker Direct via Amazon offers the second generation Anker Astro E4 13,000mAh External Dual USB Battery Pack in Black for $29.99. Coupon code "6F3QHIPX" cuts it to $23.99. Plus, Prime members bag free shipping. (Non-members can get free shipping with orders of $35 or more; otherwise, shipping adds $5.99.) That's tied with our February mention as the lowest total price we've seen. (It's a current low by $6.) It features an LED flashlight, fail-safe protection, and two USB charging ports.