They do, and I have. The only gas powered one I have seen is a C5-R pictured here RC Corvette it's not a great picture but I saw one of these being driven around at a Vette show and it was pretty darn cool, not cheap though. I have seen all kinds of battery powered Corvettes, just do a search on eBay.
They have Super Nitro (1/8 Scale) cars that are C5-R's and they have 1/18 scale electric cars. They also have bodies for 1/10 scale cars. I have included a pic for you to see, it is an example of one of the kits from HPI. I can not say that they still make them, I am not sure. This picture is from the HPI website for RC. Look at the kit section and the body section, that might help.