I build kids bows and am friends with many others that do to... I build a longbow though...
My daugthers are 8 and 10, they both shoot a 48" bow right now. A 48" bow is just fine clean up into the lower teen years...heck, I have a 48" recurve I shoot....
Anyhow, if you are interested, my kids bow is also $100 + S&H... I will also second the vote for Mike at Maddog bows... he builds a fantastic kids bow...
Good Luck,
Ernie