Meritline offers the Kensington Rechargeable Pocket Booster Battery Charger, model no. K38036US, for $9.99. Coupon code "MLCK322JNL1" cuts it to $7.99. With free shipping, that's a buck under our August mention and the lowest total price we could find by $4. This device purportedly allows for up to three hours extended talk time on mobile/smart phones. It comes with a USB cable and two rechargeable AAA batteries. Coupon expires after 100 uses.