I have to agree with Dainerra. At this point, it may be too late for you to have any sort of screening before the puppies are born and you'll have to keep that in mind when pricing the pups. It doesn't necessarily mean people won't buy the dogs, but some people may ask about health tests and the status of the two parents. With dogs, just saying the parent is healthy doesn't mean much, as there are many conditions that the pups can pick up which the parents don't show and some that only show up later in life. Both these large breeds of dogs are prone to lots of health issues and as the previous poster mentioned, many of these issues could make it impossible for the dogs to perform their jobs.
With that said, I'm sure there are still people out there looking for LGDs. My family purchased an ACD 15 years ago from a backyard cow farmer (his parents had no tests that we knew of). This breeder sold females for $150 and males for $100. He was a great lgd and herded when we needed him to. However, I wouldn't expect to make too much money with these pets. Personally, knowing that those breeds are prone to many issues, I probably would not spend more than $200-$300 depending on how desperate I was and my need for an lgd. You don't want to price them too high and get stuck with older puppies. I would also recommend taking deposits from people who say they want a puppy. It's way too easy to back out once the puppy is born if you didn't give a deposit on the dog.