The guy who runs that site might.
There are several custom brushmakers on B&B.
Rudy Vey comes to mind - all of his work that I've seen looks top notch.
And if I'm not mistaken, he offers very good pricing as well...
Tony has a wide range of knots available and quick postage!
I use this black and orange material quite often in my brushes.
Rudy, Central New Jersey
'If you lend someone $20 and never see that person again, it was probably worth it.'