I wouldn't do it just because you never have any idea what kind of health issues you might end up with. You can get low-quality male pastel hatchlings for $75. Ask for pics in natural light on a white background (black makes yellow look better) and get an opinion on quality.
Black Pewter het Hypo Vestris; Black Pastel Enchi Zamira; Black Pastel Cheryn; Hypo Enchi Sofia; Lesser Pastel Eren; Super Mojave ???; Piebald Mako; Fire Vin; Pastel Estelle; Spider Hanji, Ezri; Normal Angelina, John, Aradia; Mojave Joe; Anerythreustic Kenyan Sand Boa ???; German Shepherd Dog Atticus; Rats Snowman, Colette, Calliope, Eliza, ???, ???
The price is good, but a one year old ball python should easily be approaching 2 feet and several hundred grams. If it is one foot long it would suggest that it has been malnourished. Get some more information on the snake.
Definitely get up to date pictures if you're thinking about it. But I'd be careful. They may have been guessing at the length but one foot is really small for a year old BP. It might have feeding issues or it might not have been cared for properly.
Yeah eesh. My six month old BP is about two feet. And if you're wanting the male for a stud I'd look from a breeder with nice pastels. Better to spend more and get nice bright pastels.