If you've only looked via internet search, Country Home always comes up first. She is a well known and poorly regarded broker, and not just of Yorkshire Terriers. She's a clever salesperson.
My favorites: Cheryl Kroll of HiHopes, Sturbridge,
hihopesryk@verizon.net
Donna Plumpton, Jubilee, Manchester NH
Beth Faunce, Fairhaven MA
These are people I know personally who I would not hesitate to purchase from.
Last, but not least, you should have a look at my puppies: Susan Dodge, Clover Hill Yorkshire Terriers, Lawrence MA,
www.cloverhillpups.com
I have great dogs, great references, lovely puppies, lousy salesmanship skills, and I'm fussy about who gets my puppies. I give you all the facts and information, no slick presentation. If you examine my puppy as if it's inanimate merchandise rather than interact with it, I will likely not sell it to you.