That doesn't help if you tend not to read the sorts of popular books that are easy to find in second-hand bookshops. Nor if you don't want to spend a bunch of

That doesn't help if you tend not to read the sorts of popular books that are easy to find in second-hand bookshops. Nor if you don't want to spend a bunch of time shopping for books that may or may not be in stock. In my experience, second-hand bookstores are great for serendipitous finds - books that look interesting that you weren't looking for and maybe didn't know existed, not so much for finding a specific book.