Actually I was thinking it was remarkably inexpensive

Obviously, prices will always vary by area, so the advice of someone fairly near to you is the most valuable, but anytime this sort of topic has come up on the board in the past, prices tend to be closer to the $1000-1500 range for puppies from properly health tested stock.
A white puppy may be a little cheaper than his coloured littermates, but really, it isn't likely to be all that much. A white puppy cost exactly the same to produce and raise as his coloured littermates...