It really doesn't matter to me personally how much of a "deal" this pup is. A really well bred prospect with a pedigree that has an inherent value might cost you $500. If you think that is too much, then you need to calculate what the cost of making a poor decision on a dog that might perhaps turn out "OK" - a dog that will bring with it an on-going cost accrued over approximately 15+ or so years. That's one heck of a price to pay for a mistake! But then again...we do have rescues services so...no problem, right?
I really struggle with the concept of a "deal" pup/dog when I consider the over-all cost of acquiring, training and maintaining a well-bred working specimen.
The old boys used to say, "It costs the same to keep maintain a good dog versus a piece of ____ dog."
So, what about this dog - it's genetics/breeding, it's sire/dam, it's health, it's demeanor, it's natural abilities? That is a priority, but again that's just me. Without these entry level considerations, I won't take a dog for free, knowing what the ensuing costs will be to develop a dog that might potentially turn out reasonably acceptable.....maybe.
I'm not even going to take cursory consideration of any issues this dog might bring with it from the get-go that you will need to resolve just to get to square one.