
I would be very surprised if you found one from health tested parents within that timescale. Newfoundlands are relatively rare and black is by far the most common colour. I spent 18 months looking for my Newfie pup and she just happens to be brown but I had no colour preference.
As you have not left any contact details, I would suggest you get in contact with
http://www.thenewfoundlandclub.co.uk/ who will be able to point you in the direction of reputable breeders.