Looking For A Full Blown Mod 250f

I am trying to find a full blown mod KTM 250sxf like the ones the professionals ride, but it seems to be harder than you can imagine to find one of these bikes. I did find Chad Reeds 450f Honda which is really cool, but I am looking for a 250f preferably a KTM. I really need one for my son for the motocross which will be starting in about 3 months. Well if you know anyone getting rid of a factory bike please let me know I am really interested. Or if you have any suggestions on who will build the best bike I might have to take that route too.