I'm just posting this here to possibly help future people like me.
I wanted to acquire 2 different books that I learned about here on SB. Of course I went straight to Amazon and found them both only available Used, in the Marketplace for well over $100 each. I (wrongly) took that to mean that they were out of print and I was out of luck (since I was not willing to pay that much for either book).
I have now found that both books are in print and available directly from their respective publishers. Here are the links:
Mastering Rebreathers, by Jeffrey Bozanic
Mastering Rebreathers, 2nd Edition
SCUBA REGULATOR MAINTENANCE AND REPAIR, by Vance Harlow
SCUBA REGULATOR MAINTENANCE AND REPAIR by Vance Harlow
And, here are some other scuba books that aren't necessarily so hard to find, but that I have personally read and thought to be good books. Maybe this can become a growing list and a sticky.
The NOAA Diving Manual, 5th Ed.
NOAA Diving Manual, 5th Edition Softcover Textbook
Deco for Divers, by Mark Powell
Deco for Divers: A Diver's Guide to Decompression Theory and Physiology: Mark Powell: 9781905492299: Amazon.com: Books
The Six Skills and Other Discussions: Creative Solutions for Technical Divers, by Steve Lewis (aka
@Doppler)
The Six Skills and Other Discussions: Creative Solutions for Technical Divers: Mr Steve Lewis: 9780981228020: Amazon.com: Books
Staying Alive: Risk Management Techniques for Advanced Scuba Diving, also by Steve Lewis
Staying Alive: Applying Risk Management to Advanced Scuba Diving: Mr Steve Lewis: 9780981228044: Amazon.com: Books
Diver Down: Real-World SCUBA Accidents and How to Avoid Them, by Michael R. Ange
Diver Down: Real-World SCUBA Accidents and How to Avoid Them (International Marine-RMP): Michael R. Ange Captain: 9780071445726: Amazon.com: Books
Deep Into Deco: The Diver's Decompression Textbook, by Asser Salama
https://www.amazon.com/Deep-Into-Deco-Decompression-Textbook/dp/1930536798/
(My opinion: Deco for Divers was easier to understand and Deep Into Deco contains very little additional info beyond what is in Deco for Divers. If you want more theory, then you might go straight from Deco for Divers to one of Bruce Wienke's books. I have Basic Decompression Theory and Application and it is DENSE.)
SCUBA: A Practical Guide for the New Diver, by James A LaPenta (aka
@Jim Lapenta)
SCUBA: A Practical Guide for the New Diver: James A Lapenta: 9781494900250: Amazon.com: Books
The Underwater Photographer, by Martin Edge
https://www.amazon.com/gp/product/B00IC84JLI/