HI
The best thing to do is to contact the newfoundland club who will then be able to send you a list of any puppies that are available, when I was looking for my puppy I contacted the breeder then was put on a waiting list for their next litter, all in all it was 6 months from starting my search for a puppy untill I brought her home. If you go via the breed club they will put you in touch with reputable breeders as newfies are a breed that puppy farmers breed, I was also told by the club secretary that you should be very suspicious if you find one for sale for less than £850. When I contacted the club they very helpfull and sent me a booklet telling you what to look out for in a breeder and what health checks they need.
Good luck
Nikki