[thayne]

For some kinds of things, I don't have a local store that sells it. Maybe that's less of an issue if you live in big city, but not everyone does.

[retSava]

Yup, an important caveat. And sometimes, it may not be available, due to it not legally being allowed to be sold there (eg not following relevant regulations). And that's a valid enough reason for it not to be sold there, regardless of seller.