Lenovo offers its Lenovo PB410 5,000mAh PowerBank, model no. PB410, in Silver for $29.99. Coupon code "USP1OC146288" drops it to $17.99. With free shipping, that ties our April mention as the lowest total price we've seen. (It's the the best we could find for a similar item by $11.) Features include intelligent charging and a full-metal shell for impact protection. Deal ends October 1.