Just seeing this now. Please go to
www.ytca.org and go to the breeders page there.
Also be advised that no reputable breeder will breed for "tinys". Sometimes breeders will have a smaller than normal puppy. And usually these breeders are very careful where they place a "tiny". For many good reasons, such as a tiny is more easily injured, may have more health concerns, and risk wise tinys certainly can have more serious problems. Reputable breeders in placing a "tiny" will usually look to experienced dog parents with Yorkies, and in a home without kids etc.
I'm sorry that you were unable to bring your first dog to a state of health. Please re consider if you truly have the knowledge and experience and funds, to care for a "tiny".