Today only, PricePlunge offers the Kensington Rechargeable Pocket Booster Battery Charger, model no. K38036US, for $5.99. With $3.49 for shipping, that's tied with our mention from a month ago and the lowest total price we could find by $5. 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.