Today only, All4Cellular offers the AT&T Zero USB Travel Charger for iPhone / iPod touch for $1.99. With $2 for shipping, that's the lowest total price we could find by $21. This wall charger purports to be 100% energy efficient when it's not charging a device. It includes a charging cable compatible with Apple iPhones, iPads, and most iPods (see "compatibility" at the product page).