GOOLOO is hosting a deal at Amazon that drops the price of its dual USB car charger down to just $3 with coupon code PVL7RNOX, a savings of $4. With having two outputs, you'll be able to charge multiple devices at the same time without having to have a splitter or alternate between what gets charged. One of the outputs is at 2.1A while the other is at 1A, so one will charge faster than the other.
Full story from the WindowsCentral blog...