Roadies for kids is a tough order these days - I have 9 year old also who wants to give it a go. I did a search several months ago and found a couple in Europe but came to the conclusion that the price, combined with the growth rate of a 9 year old boy, didn't make it worth it to me to buy something new. So, I'm looking into building something.

Here's one I recall:

http://www.veloargon18.com/eng/bike_9.htm

55/Rad