Here are a couple that come up on Kiji. I haven't had any experience with them, so make sure you check them out thoroughly.
CKC Registered Yorkshire Terrier - Saskatoon Dogs & Puppies For Sale - Kijiji Saskatoon Reg'd Yorkshire Terriers - Saskatoon Dogs & Puppies For Sale - Kijiji Saskatoon
or I bought my 2 1/2 year old from this lady:
drussell@facmail.com
You can check out her website here:
CKC Registered Yorkshire Terriers - Double D Miniatures
it's not updated, but she may have puppies available.
Good luck!
There are lots here in Calgary.
Michele :-)