I just spent $165 with shipping on a corn. Our local mom-and-pop pet store breeds BP's, and seems to price everything at $100, so that might be likely several months from now. Could be less; I am interested in a pet only, and I like normals.
Definately under $500. One can easily spend that just for the enclosure and the basic equipment. We keep a strict budget, esp. for discretionary items - a $500 plus snake just isn't going to happen.