That is a rare ball python. You don’t see many normal anymore. 
You should not pay over $50 for a ball.
I personally wouldn’t pay over $25 normal ball. But I am a boa guy.
Many, many years ago, I paid $12.50 each for 25 balls, and that included shipping.
Now adays I only sell what I produce. That’s why I only sell boas. And guarantee what I sell.