When you are looking for a new baby, stay away from any breeder that advertises tinies, teacups, miniatures, micros, etc. This is simply a marketing ploy to get more money out of buyers. There are some reputable breeders that may have a smaller yorkie puppy from time to time. However, they will not advertise them as teacups to capitilize on the small size...they will be very concerned with placing that puppy with the right home for the puppy's health & safety. And they will NOT intentionaly breed for the small size.
Good luck in your search! Take your time & be patient. Buy your breeder first, then your puppy.
