Tanga offers this iPhone 4 to iPhone 5 Dock Charger Adapter in White for $6.99 plus $3.99 for shipping. That's $4 under our mention from four days ago, $18 under what Apple charges for its adapter, and the lowest total price we could find for either version by at least $4. This Apple Lightning-to-30-pin adapter is also compatible with select iPad and iPod models. It's available in short or 17cm corded sizes.