Today only, Tanga.com offers the Xantrex XPower Pocket Inverter FM Car Power Adapter for $17.99
for shipping. That's the lowest total price we could find by $3. This device converts a 12-volt DC car "cigarette lighter" outlet into a 120-volt AC 3-prong outlet. It features voltage protection, overheating protection, 34" cable, and an FM modulator (which allows you to stream stereo audio through your car's FM radio from a charging device).