BookMooch is an online community for exchanging used books. There is a point system for members....every time you give a book away you get a point. You can also receive points by donating your books to charities. Your only cost is the mailing of the book...which from New Zealand can be sometimes pricier than the book (although you do get more points if you send your book to a different country).
The founder (John Buckman) stated he was was" frustrated by the vast number of books that were printed in just one country but not any other, or only after several years."
Where there's a will there is a way.....let's find those previously loved books a new home!