Yes indeed. $3.99 can get you a book at a used bookstore. But you might not be able to find the one you want immediately. Used bookstores are for explorers, not buyers.

Besides, $3.99 isn't enough for a popular title or a hardcover. However you can get them through swapping with a flat fee.

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We'll focus on one thing and make it work. In our case it's book swapping. If our service is good then we'll have users. I don't think there's other way.