Apologies llamekuf.
The title of this Thread (name of this 'Forum' is Crossword Help Forum)does say "books to sell or swap".
But why not use eBay rather than a crossword site if you want to sell a book?
Or,if you don't need the money give it to a library or charity shop.
I do and sometimes just leave a book on a bench with a note saying - pass it on when you have finished.(library/charity normally want good condition).
Aren't i great?