If I were looking for another pup, I'd start with the AKC site, weeding out the good from the bad of course. Just because they're registered AKC doesn't always make the breeder "reputable".
I have 2 already...Tuffy, the first one from a broker who represented themselves as the owner
My Bella was owned by show people who rehomed her when they figured out she was going to be oversized.
These pages in the YT library may be helpful:
Breeding and Breed-Specific Library - YorkieTalk.com Forums - Yorkshire Terrier Community
Good luck in your search & welcome to YT!