I would be tempted to look in the ansmamm section
http://www.oople.com/forums/forumdisplay.php?f=81
at the man rat ready to run 2 wheel drive cars, thought to be a cheap start, cheap spares etc, you will break loads!. You will also need a lipo battery & lipo charger. give you something to look at until someone else comes along and contradicts me
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I would ask around trackside, often good secondhand stuff especially this time of year when drivers are changing kit for 2012.