The Yorkshire Terrier Club of America is usually a decent place to start looking for "reputable" breeders. I checked their site (
Yorkshire Terrier Club of America) and could only find one listed but they listed only a rescue, no puppies. I'll attach their info below. I'd start with them and make sure the info is up-to-date. They may be breeding now. Also, even if they aren't, they may be able to steer you in the right direction. Vets are usually a good place to ask as well. I hope some of this helps a little.
- Byron
Daisy C. Yamada
Honolulu, HI
96814-2458
(808) 949-6200
Home and fax
daisyyamada@hawaii.rr.com