All Dog Breeds Adult Dog Wanted

Dear all, I am looking to find out if any one has or is expecting any puppies of the following breeds...Leonberger, Pure bred English mastiff, alsatian, maso mastiff, Great Dane. We are looking to add two more dogs to our growing dog family and we absolutely love the mild tempered giant breeds. We are only looking for puppies due to the presence of two adult dogs who are not keen on new adult dogs but are great with puppies. If anyone knows of any breeders is the area, please drop me an email. Thanks Vikki