I got my Border Collie/ Great Pyrenees crosses for 75$ apiece. I have spent far more money in vet and food bills than their initial cost. I see full blood Pyrs, Anatolian Shepherd, and Pyr /Anatolian crosses around here regularly for cheap. They are getting more prevalent, and farm dogs will have puppies their owner wants to get rid of.
I have seen puppies around here for a couple hundred but I don't really want to start with a puppy. I would prefer one that has been working with chickens already. The breeders I've found want 1800 or more and even the random person wants at least 500.