AnkerDirect via Amazon offers Prime members its Anker 18-watt Dual USB Car Charger in White, model no. AK-71AN1852C-WA, for $11.99. Coupon code "CARDEALS" drops it to $7.99. With free shipping, that's $22 off list and the lowest total price we could find for an 18-watt dual USB car charger. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping adds $5.08.) This 18-watt charger is compatible with iPhone, iPod, BlackBerry, and many other USB devices. It can charge two devices simultaneously.