Welcome to YT! Lucky you will have one of our favorite members here for a neighbor soon. livingdustmops (Cindy) is moving to Phoenix soon and she works with rescue yorkies and may be able to help you with info.
Use the search to read threads on 'teacup' ....reputable breeders do not advertise with that term, or even try to produce tinies since health is their first concern.
www.ytca.org has a breeder listing....and a code of ethics and breeders.net(by zipcode) usually has less scam listings than many of the other places on the net. Best of luck in your search!