I'll first explain how I got started with pieds in the last several months. First I bought a 2010 male visual medium white pied for $500 local pick up. Next I bought two female het pieds also local pick up. One is a 2010 900g het for $150 and the second is a 2011 800g het for $100.
I bought the male first but normally you want to start out with females. I got a great deal on my het females, normally they're quite a bit more for their size.
Buying young and buying hets will be the cheapest way to go. The only problem is you have to wait at least 2-3 years for the females to get up to weight. If I were you I would buy 2 het hatchling females and then a year or two down the road buy a visual male.
Female het hatchlings run about $100-300. Male het hatchlings run about $50-150.
Female visual hatchlings run about $600-900. Male visual hatchlings run about $400-700.

The older the snake the higher the price.
If it's visual then the higher the white the higher the price. But pieds can throw any amount of white and is not dependent on the parents' amount.