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Cheap ones are exactly that. Cheap. Do yourself a favor and by one that is a name brand. If you don't, you'll be replacing fuses in your car when they short out.
monoprice.com
Search usb car chargers and you'll see they have a car adaptor with a USB plug that provides 1000mA for charging and you can plug in any usb data cable (usb-to-usb micro, usb-to-usb mini, etc). It also has protection circuitry to prevent overcharging. In comparison, the rapid charger for the Nexus One runs at 980mA. The best part about the monoprice.com charger? It's a $1 and change and unlike other sites, you can ship via USPS which is reasonable and cheaper than UPS ground. If you've never heard of this website, it's very popular for home theater enthusiasts because they sell high quality hdmi cables for much less than brand name stuff. People swear by them. I swear by them as I've been using their stuff for years.
i'm going to wait for the Google car craddle... it will have a charger built in obviously
Do the world a favor and off yourself, or at least know what you are talking about.
The one I listed is from Motorola and is a "cheap" one.
A second for monoprice.com