Ferret for food?

[Bogertophis]

...I guess I have to question why as well. There are plenty of food sources out there. Why not just buy actual snake food?

Besides the "variety"aspect & being "free", they probably have issues (health, age or attitudes) that make them not salable as pets...just my hunch.
They might have just been 'breeders' in a ferret mill that weren't socialized, who knows? Or expensive health issues the owner is shirking.

I think I'd try to find out though...if they're truly good pets, I wouldn't. If not, go for it. Ferrets can be delightful (if destructive) pets, or just be "weasels".