Hi Kelly,
Good luck with your puppy search! It can be really hard and so tempting to buy a sweet little one...just be sure to do your homework. Yorkies have several health issues that can be very expensive to treat to downright life threatening. There is a wealth of information on YT that you cannot find in books.
Also if you get some spare time please visit
Puppymills - Information about puppy mills and how to shut them down.. WARNING very sad but unfortunately a reality even for our precious Yorkies. Anyone advertising they are U.S.D.A. certified please do not do business with them and never buy from a pet store.