If someone is only interested in the contents, I think many (if not all) of those books are available online in PDF format. Some are even full page-by-page scans of the original, instead of just the text.
Edit to add: I am not referring to the books by Raymond Franz, which are protected by copyright. I would note that Crisis of Conscience is available on Amazon Kindle for $8. But In Search of Christian Freedom is not, sadly.