Groupon offers the Griffin PowerBlock Plus 2.1-Amp Wall Charger for Apple iPhone and iPad for $8 plus $2 for shipping. That's the lowest total price we could find by $3. It features a polarized pass-through socket and 30-pin to USB cable. This charger is compatible with the iPad (all models), iPhone (all models but 5), and iPod (except 5th-generation touch and 7th-generation nano). Deal ends December 22 at 1 am ET.