Goldens are great dogs, but they do seem to be quite prone to cancer. I used to be in a Yahoo! Canine Cancer Support Group when my Corgi was battling lymphoma. I think there were more Golden owners there than any other breed.
German shepherds are also prone to high rates of cancer. Three of my GSDs passed away due to cancer.
Lost our golden doodle to cancer. She had multiple bouts over the last 4 years, most of which appeared as lesions in her skin. Best dog I ever had and she is badly missed.
Backyard breeders.
In my area, there are *always* Golden puppies for sale, usually by Mennonites.