Tough situation.
Very pretty snake.
I am no expert on pricing though. I would pay $175 for that snake, but that's just me. Do you plan to breed or just keep as a pet? How old is he?
If the latter I wouldn't worry so much about her genetics, but if you do, difficult to confirm het anything without breeding.
If you take him home, just remember to quarantine, which I imagine you already know.
Good luck and keep us in the loop.