All4Cellular offers the Stitchway 1900mAh Backup Battery for iPod / iPhone, model no. CHEX-ALL-BK-08-319, for $4.95. Coupon code "A4C10" cuts it to $4.45. With free shipping, that's tied with our mention from two weeks ago as the the lowest total price we've ever seen for this battery. (It's also a current price low by 30 cents.) It purports to offer a full charge in less than two hours. Deal ends on April 30.