I have at least a dozen if not two dozen bibles. As another commentator mentioned there's many translations, I've got mostly English Bibles, but I do speak Spanish as well, so I have some Spanish ones, one Hebrew (Old Testament / Tanakh only) and a Greek one too.

So it wouldn't be too hard depending on the purpose of the Bible (is it a study bible? or a new translation, what is the focus of this translation? etc). It could also be a gift for somebody else. I've gifted a good number of bibles, even ones I absolutely loved.

The people outside a church might already have bibles, but they're also a community shown to have an interest in bibles. Even if they already have them, they're still likely to have more interest in getting more than the general population as a whole.

On the other hand, trying to sell bibles outside a synagogue is probably not going to get you a lot of success.

There are so many different translations that it should be pretty easy to get people to buy a second and third bible. There are also study versions that crosslink verses on the same topic (e.g. if you want to read all there is to read about angels), and then of course there are versions with commentary.