Thanks, about 15% of the links to bookshop.org goes to a 404 page as they don't stock used books and don't have all the books Amazon does. We are working with t

Thanks, about 15% of the links to bookshop.org goes to a 404 page as they don't stock used books and don't have all the books Amazon does. We are working with them to find a way to make our system smarter, as right now they block our server from even checking their site for a 404.