The American Black Welsh Mountain Sheep Association operates a registry for purebred Black Welsh Mountain Sheep. There is more breed information on their website.
Instructions: If you put cursor over a pin and click the breeders information will appear. On some of the breeders maps the pins are so close together on the zoomed out map that you can not see all the pins marking individual breeders. For those situations I recommend clicking on the blue words below the map to see a larger version that also shows the list of breeders in alphabetical order along the side.
View Black Welsh Mtn Breeders in a larger map