YTCA is the best place to start looking. The breeder mentioned on the first page of this post is Dorren Hubbard. She is listed in the officers "YTCA Officers" tab:
http://ytca.org/
My wife and I have one of her babies. Molly is now a senior citizen. I also have MeToo who is from Rebecca Rmasey who is the secretary of the Mt Rainier club.
A good breeder is not breeding for money and they also will not let puppies go that are younger that 12 weeks. Both of our girls are "pet quality". Dorren, Becky and other breeders that show will not sell a show quality pup and will definetely not sell a show quality pup to someone who will not show their line!
We got Molly at 14 weeks and did not get MeToo until she was 3 months old.
MeToo is our 5th Yorkie.