I bought this car charger at wirelessground.com. It is an OEM product. It was $19.95. Here's the link:
http://www.wirelessground.com/spppcarcho.html
They have other Mogul accessories too. I found this company to have the best prices as I looked at a lot of sites. Placed the order online but I also talked with customer service. The rep. was very accommodating and quick to help me make a change with my order before it was sent out.