Lenovo offers its Lenovo PB410 5,000mAh PowerBank, model no. 888016288, in Silver for $29.99. Coupon code "USP1JA456288" drops it to $17.99. With free shipping, that's tied with our mention from two weeks ago at $12 off list and the lowest total price we've seen. Features include intelligent charging and a full-metal shell for impact protection. Deal ends February 4.