For my books that have been published and which are in Google Books, go to the link below. Clicking on the cover of the book brings up more information. In the left hand menu area there is an indication of whether it is available as an e-book or print only. Also in the left hand menu area is a list of distributors, e.g. Amazon. Clicking on Amazon will give information about the particular book, its availability, and price etc. The link from the book in Google Books to Amazon is automatic, i.e. you don’t have to type in the book title. Often second hand (i.e. used) copies of the book are available at a much reduced price via Amazon.
Amazon book list --
https://www.amazon.co.uk/Books-Rae-Earnshaw/s?rh=n%3A266239%2Cp_27%3ARae+Earnshaw
Google book list appears to have stopped working currently. Not sure yet why this has happened. It could be Google has changed something behind the scenes and the link is now elsewhere. I will look for it and then replace the link below.
http://books.google.com/books?uid=110492148649215898944&source=gbs_lp_bookshelf_list