Fremo via Amazon offers the Scud Panku 10,000mAh Slim External Battery Charger in Coffee or Silver, model no. PC-10000P, for $29.99. Coupon code "36FEAT5S" cuts it to $19.99. With free shipping, that's a buck below our mention from last summer and the lowest total price we've seen. (It's a current low by $10.) It's designed for charging tablets, smartphones, and other mobile devices.