I for one ask all of the potential breeders whose puppies I maybe interested in on their health certs. I refuse to pay $400 for a dog who hasn't had it done on the parents at least. In fact, I refuse to pay anything over probably $200 on a dog who hasn't. I also ask about a guarantee, which I expect on puppies at the $350-400 range and up. It should be no problem to give one if you're breeding quality labs. In fact, I would consider paying $650-700 for a well bred, fully health certified, heath guaranteed pup. But that would be the absolute limit.