Are you an avid reader? I am! And while I love the library it is not always convenient for me to get there. So I have purchased a lot of books online over the years. I typically purchase them used through Amazon.com. I had quite a large collection of books accumulating when I came across a great site! It is called Paperback Swap. I have been using Paperback Swap now for about a year or so and love it!
The basic idea behind it is that you create an account with them, list the books
that you would like to give away. Then when another member requests one of your
books you mail it to them, with no shipping charge to the person who requested
it (you pay media mail shipping rate and can even print out the shipping wrapper
w/postage on their site) . This will give you one credit.
Now with your credit
you can request a book from another member, they pay the shipping to send the
book to you. You will get two credits for joining the site to begin with so you
can request a book right away to get a feel for it. You will want to start your
book list right away (entering in the books you have to give away) so other members can
begin to request books from you. It is really easy to use and the site is big
with a huge amount of books available to choose from.