I'm assuming you mean anthill pythons and not childrens' pythons?

Anthills are the smallest python in the world, are pretty hardy in captivity and can be kept like your average terrestrial python except on a smaller scale. I was looking into them just a short while ago and decided my budget didn't have it in it, I was looking at a few breeders' websites and they were in the ~$500 range.. Certainly more expensive than childrens', which are a slightly larger alternative that are closely related.

I sure wouldn't mind having a pair in my collection.