I used to have Blue Faverolles from Catulpa Farms however not pleased with the outcome on that. There is much work needed on their end to avoid the fifth toe absence and no feather footed. I had three chicks out of five that ended up like that. Definately not happy about it however the Blue Fav pullet I gave away to a friend now put her with EE roosters and Blue Orp rooster. She has a beautiful beard!
Dick Boulanger has some Blue Faverolles and he said there is much work to be done on them because of the traits do pop up that are a no no in the breed. Its a fairly new color the breeders are working on. From what Catulpa Farms told me by email, they were third and fourth generation of Blue Favs and problems cropped up on that. That is why you dont see Blue Faverolles listed on their website but I am certain you can contact them if you want some.
Good luck and there should be more breeders out there!