When you say tiny?? What do you mean? Most reputable breeder of quality don't breed there dogs to be tiny but sometime they pop out. So if you go to a good breeder you will never know if they are "tiny". Most will be 5lbs and up...They like them larger for Show and breeding." yorkie of excellent quality." means??? Show lines with others rating them,good health?? The word Tiny makes me thing you want a really small one 2-3lbs? A breeder with ethics isn't going to try to produce that.. Just trying to be clear on what your asking?? You can start here and good luck with your search.
https://www.apps.akc.org/apps/breede...?action=search