You can buy used books, they sell extremely cheap and are perfectly readable. There is a lot of seller, at least in France, but I guess it must be similar in usa.
Not invalidating your comment, but sometimes paying "new goods" means to support the creator.
Used books in France appear extremely cheap because new ones can't be discounted. By law (I think) retailers only allowed to offer a maximum 5% off.
Used books are exempt from the law entirely, so they're priced by pure market forces.
In countries like the US or UK, a recently-published book might already be 40% off list price, so used copies may not be as much of a bargain.