You could do a club search for your state or any of the others to look for an AKC sanctioned conformation club. These clubs usually have a puppy referral person who helps people who are looking for reputable breeders of purebreds. There are also specialty clubs that work with just one breed.
Sometimes breeders have older pups they are willing to sell or show dogs that are retired.
Of course you always want to check out any breeder for yourself. Visit the breeder if at all possible and get references.
Here is a link that can help you with your search:
American Kennel Club - Club Search and Directory