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https://www.humblebundle.com/books/linux-unix-oreilly-books?partner=thetalkinggeek

$1 Tier:
Classic Shell scripting, first edition
Linux device drivers, 3rd edition
Introducing regular expressions, first edition
Grep pocket reference, first edition
Learning GNU emacs, third edition
Unix power tools, 3rd edition

$8 Tier:
Learning the bash shell, 3rd edition
Learning the vi and vim editors, 7th edition
Linux in a nutshell, sixth edition
Sed and awk, second edition

$15 Tier:
Bash cookbook, second edition
Linux system programming, second edition
Mastering regular expressions, 3rd edition
Effective AWK programming, 4th edition
Linux pocket guide, 3rd edition

https://www.humblebundle.com/books/linux-unix-oreilly-books?partner=thetalkinggeek