I read the email regarding how helpful and informative the book, Retonos de Espana, was to one of our members. My question is, is the book available for sale, and if it is how do we purchase it?

I read the email regarding how helpful and informative the book, Retonos de Espana, was to one of our members. My question is, is the book available for sale, and if it is how do we purchase it? What is the cost?
Thank you.