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As far as the purebred BBS Ameraucana, I do not know as some people do market their birds as pure but some aren't. You would have to seek out a reputable breeder. Here is a list of breeders from all states. Pure birds are referred to as "standard bred" which means they are bred to the American Poultry Association Standard of Perfection.
http://ameraucanaalliance.org/DnLd/Directory.pdf
As far as the Dominques, they will most likely be hatchery chicks and not from a breeder. You will have to search for a breeder and I would start with looking for a club for Dominques. With hatchery chicks they do not selective breed their parent stock. It is just a barn full of males and females.