AnkerDirect via Amazon offers Prime members its Anker 15-watt Dual USB Car Charger, model no. AK-71AN15WCC-BA, for $5.99 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $5.14.) That's $4 under the lowest total price we could find for a comparable charger. Sales tax is added where applicable. This charger is compatible with iPhone, iPod, BlackBerry, and many other USB devices. It can charge two devices simultaneously.