I think smokin pocketbikes is starting to bring in the conti's. They are around $7,000(last time i checked). I dont kno a web site for them, but i have seen one before and it is awsome. The whole bike is adjustable.
You can contact me and i can give you all the information that you need to get a bike and get in with the MiniGP program for you kid. I am the midwest Metrakit Rep so I can help you out in getting a full set up bike.
I'll keep you guys in mind. It won't be until Oct. timeframe. He'll need to run the season on his X18, and get alot better before I drop 4500 bucks on a new bike. He's already in a minigp program with racecmrra . com, and we'll see about ******** soon.