If you can't find Black Coppers now days you aren't looking. Check out Eggbid.com, about every other egg and or chick is Black Copper. Some are from quite reputable breeders. Many are birds or chicks that were purchased a year ago from reputable breeders.
I think the breed in general has a long long way to go to be real solid. I think I am going to sell all of mine and go down a different path. I am not sure I have enough knowledge and more importantly patience to work with the breed to the extent that they still need work.