You might want to check our Dog Directory for any listings in PA.
Just click on the Dog Direcotry Forum at the bottom of the forums
page and then click on Dog Sites or search for the breed.
I would try the AKC classifieds as all of the breeders on that site are good. I looked for Portugese water dogs myself right now and only found breeders on that site from CT and OH and WA. Sometimes it is worth traveling a little to know that you are getting a well bred, tested dog.