I used to get my Marc Petitjean CDC from Bob Marriott's in Los Angeles. I do not think they carry it any longer. That, along with Trout Hunter and Polish Quills CDC are probably the best CDC that one can find in the U.S.
Trout Hunter:
http://trouthunter.shoplightspeed.com/fly-tying/
Polish Quills:
https://polishquills.com/index.php?r...t&product_id=2
Check Google for shops that carry the Polish Quills CDC...
PT/TB