Today only, All4Cellular offers the Stitchway 1900mAh Backup Battery for iPod / iPhone, model no. CHEX-ALL-BK-08-319, for $3.99. With $2 for shipping, that's $1 under our mention from last week and the lowest total price we've ever seen for it. (It's also a current price low by $2.) It purports a full charge in less than two hours.