If you want a pure blood dog and have no idea how to get in contact with breeders in your area, I can think of two options:
1/ go to a vet (weterynarz) and if he/she speaks English (or other languages) ask him if his clients don't have a puppy for sale (puppy - szczenię, szczeniak) - you may ask for a puppy with all the documents used in breeding or simply for a pure yorkie but without papers (I think a breeder can register only a certain amount of puppies from one birth, because, when a b*tch gives birth to for example 10 puppies at once, the ones that are born as the last ones are usually weaker, so they can't be registered with the Kennel Club)
2/ contact Związek Kynologiczny w Polsce (member of FCI),
zkwp.pl/zg/index.php?l=en (in English), they have branches in Gdynia and Sopot
Gdynia branch:
81-404 Gdynia, ul.Kopernika 23
Number of branches: XLII Tattoo: 000W
Phone/Fax: (0-58) 622-64-42
Bank account: PKO SA I O/Gdynia 92 1240 1239 1111 0000 1642 8100
Office hours: Monday, Wednesday, Thursday 4.00 p.m-7.00 p.m, Friday 10.00 a.m.-3.00 p.m
E-mail: gdynia@zkwp.pl
www: gdynia.zkwp.pl (in reconstruction, so you won't find much info there)
(im looking for a yorkie)
if you mean yorkshire terrier - there are plenty of puppies for sale on that page (just look for phone numbers with Tri-City prefixes, 0-58):
Szczenięta (yorkshire terrier)
zkwp.pl/zg/index.php?n=g3