Wow just read the second thread, that is so sad.
Op, welcome to YT!!!! Here is a link to the yorkies fir sale/wanted forum.
Yorkies For Sale or Wanted - YorkieTalk.com Forums - Yorkshire Terrier Community Please take the time to read the threads at the top of the forum. There are threads such us buying from a pet store, internet buying, etc. They help point out things you might not have known of before, and they can help you avoid heartbreak.
The only true advice I can give you is buy your breeder first. When Searching for a new forever fur friend, don't go looking for puppies. All puppies are cute and can capture our hearts in a second. You need to search and look at the breeder. Are their methods/reasons for Bree it ethical? Will they be there for you for the next 15 years? (for as long as you and your pup are together) Are you confident this person will help with advice/support/encouragement if something were to go wrong?