Anyone who needs to advertise on classified ads is someone I'd stay away from if looking for a quality, purebred dog. Signs of a backyard breeder: No paperwork, breeding young dogs, breeding every heat, ridiculous prices (quality>cost, a big price tag doesn't always equal a better dog), Craigslist or similar advertisements, breeding for colour, breeding for outrageous structure, no showing or participating in sports, or proving their dogs in any way, breeders who will sell to anyone without doing any background checks or questions, etc.
I can't refer you to any breeders as I don't know any for American Bullies. Unfortunately, I would say that the majority of Bully breeders do not health test, and many breed for size or colour. You'll find a whole lot more shitty breeders than you will ethical ones.
Good luck in your search.
EDIT: Oh god, I just googled that kennel name. If you're talking about the one I found, STAY AWAY. Even from the first page I can see that many of their dogs are structural nightmares.