Welcome to YT! A good place to start when looking for breeders is
www.ytca.org They have a list of breeders that agree to abide by their ethics and code of conduct. There are several breeders in California. Even if the ones on that list don't have puppies available currently, they may be able to refer you to other great breeders that do.
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.