eCase via Amazon offers the Kmashi Victor K1 5,000mAh 2-amp USB Portable Battery Pack for $10.99. Coupon code "S6Y8AMQO" cuts it to $5.99. Plus, Prime members receive free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.25.) That's tied with our mention from three weeks ago and the lowest total price we could find by $7. It includes a charger cable and 5-volt, 2.1-amp USB port. Deal ends October 30.