Tor Sverre Lund
You can try to find Micro Machines "Micro Mini Insiders". They are the perfect size for the game and come in tons of various cars. The problem is that they are long since out of production (due to being so tiny and a choking hazard) and have become somewhat of a collectors item over they years. You can usually find some lose and open packaged ones on eBay for somewhat reasonable prices here and there, depending on which of the cars you're looking for.
It's worth looking for though if you really want some new car types. I bought a Ferrari Testarossa for my game a few years back and still use it as my car of choice.
Yup, we use quite a few of those.
You can also get a hold of the older Formula Dé cars with the changeable spoilers.