Newegg offers the RAVPower Dynamo-On-the-Go 7,800mAh External Battery Pack, model no. RP-PB09, for $19.99. Coupon code "EMCWHWA79" cuts it to $15.99. With free shipping, that's $2 under our February mention and the lowest total price we've seen. (It's also a current price low by $14.) It features a power level indicator, dual USB ports, a wall charger, and carrying bag. Deal expires December 25.