All the book are available on Amazon in your respective countries and other websites.
For Example –
Cruising for Cowards new third edition 2020 book/ebook
Just Cruising book/ebook (2021 ebook)
Still Cruising book/ ebook
Comfortable Cruising (2021 ebook)
No ebook? Refer to Amazon US/CA
Aways make sure you have the latest edition