can't say what you have to pay for feeders like rabbits, piglets or goats, but i'm sure if you will have more than one snake in a size they will need those feeders it will be alot money needed to feed them.
and if you don't have that money or just want to save it, the next thing you will though about are easy to get unwanted pets offered for free or much cheaper than regular offered feeders.
Incase you were unaware.
Rabbits tend to breed like......... well RABBITS.
That is why we use that saying. So, abundant feeders are not a problem, even for large snakes.