There are many sources of information about the breed and breeders. If you are on the internet, there is the BMD home page, packed with information and links to other sites, and addresses and contacts for regional clubs. These is also a mailing list with over 1000 members. You can learn a lot from this mailing list - the joys, sorrows, and problems associated with the breed. Everyone is welcome to join.
Prices can vary a great deal for a pure bred dog.
But price shopping is not advisable. Although a high price does not ensure a good dog, a low price nearly always ensures that the breeder is not doing the health screening widely accepted and recommended. Corrective surgeries for hereditary orthopedic problems can cost thousands of dollars, and cause much pain for the puppy and heartache for you and your family. It is wise to minimize the risk of such misfortune by seeking a responsible breeder. Be sure you understand any guarantees the breeder offers.