Newegg offers the RAVPower Dynamo-On-the-Go 10,000mAh External Battery Pack
in Black, model no. RP-PB04, for $25.99. Coupon code "DIGTRENDS512" cuts it to $18.99
. With free shipping
, that's the lowest total price we could find by $1. (For further comparison, in March we saw it for a buck less.) It features an LED status bar, dual USB outputs to charge two devices at once, and includes four connectors.