HTC Dual Port Charger
HTC's own dual port car charger features two outlets to charge multiple devices, and both ports output a full 2.0 AMPs for fast rapid charging. Charge your phone, tablet, or even a portable powerbank all at the same time. It's not the cheapest, but you'll be getting a quality charger rather than a cheapie from a nearby gas station for $2.99 that won't last long. Get a good charger, and stay full of battery.
Buy from HTC for $24.99