I didn't think there was anywhere near that many Carrera Go cars. I figured I was keeping up fairly well with all the releases I could get here in the US and I might have been fairly close to having them all, but I'm not even in the ballpark.
It appears that a lot of the cars are specific to a particular country. I saw a number of references to Australia, Switzerland, Italy and the USA. Many cars are set only (which is always discouraging). However, it will take a while to go through that site and piece together what's there. I'm guessing it is written in German and is being translated by Babelfish.
Getting Carrera Go cars will take a lot of work. It seems that if you want to try to get a lot of these cars, you'll have to make contacts in other countries. In my limited search via Google, I don't see a lot of sales sites - at least not on the first page or two.
On the plus side, Carrera has put out a lot of models considering they only started in 2001 (according to the website). They may have put out more cars in the last 8 years than any other manufacturer.
Joe