To give you an idea I sold Het Pied females this year for $75 each, even less when purchased in group.
Again since the animal is flipped, it my be het it might not be and by the time you find out, you might have paid more than market price and invested 3 years of your time + cost of food + housing for something that might just be a normal.
Again if you want an het by from a reputable breeder that will stand being it's animal not someone that bought a snake from someone and that is now selling it not having a clue of the pairing.