Create a thread and ask people who they refer-then wait and see what happens.
In the General Section.
Buy the breeder not your dog.
You said Biewer but is there a specific reason-like you want a Yorkie originating fro the Biewer's line, undocked tail-?
Anyways ask here and get referrals from here however be leery all the same Yorkie Talk doesn't endorse any of the ad in the for sale section, nor should you respond to private messages, trust me if someone says something in private verses public there's usually a reason.
Can't wait to read about your journey.
Here's just my 2 cents on Biewers:
Personally I don't have any interest in getting a Biewer from many of their breeders after seeing the issues in all Biewer to Biewer & line breeding the genetics aren't there even in cross country matching-they are too inbred leading to a decline IMHO.
I prefer to get Parti Yorkies, you can always find a breeder who doesn't dock tails or ask them not to or from a Biewer breeder who brings in Parti Yorkie genetics, which is also limited and which is why standards are bred in to parti line...
I also would never support a registration program other than AKC.
It's only Tricolored Yorkies for me, that are AKC registered.
However I'm very different from many members here who have beautiful Biewers they keep or breed and they feel drastically otherwise from me. Good luck,
looking forward to reading about your journey.