Fellow Monks,

From browsing the second hand sections of online bookstores, it appears you can get a pretty good deal on some of the older versions of the Perl CD bookshelf.
You can get even get books not available in the current version 4.0 (Advanced Perl Programming, Perl for System Administration, Perl & XML, Perl & LWP, and Mastering Perl/Tk)

Below is a table I created, showing what's available in each version of the CD bookshelf. Where available, I've include a hyperlink for each book to it's perlmonks book review. It's a pity that Mastering regular expressions was only available in pdf format in version 4!

Perl CD Bookshelf	Perl CD Bookshelf, Version 2.0	Perl CD Bookshelf, Version 3.0	Perl CD Bookshelf, Version 4.0
Perl in a Nutshell	Perl in a Nutshell	Perl in a Nutshell, 2nd Edition	Perl in a Nutshell, 2nd Edition
Programming Perl, 2nd Edition	Programming Perl, 3rd Edition	Programming Perl, 3rd Edition	Programming Perl, 3rd Edition
Perl Cookbook	Perl Cookbook	Perl Cookbook	Perl Cookbook, 2nd Edition
Advanced Perl Programming	Advanced Perl Programming
Learning Perl, 2nd Edition		Learning Perl, 3rd Edition	Learning Perl, 3rd Edition
Learning Perl on Win32 Systems
	Perl for System Administration
		Perl & XML
		Perl & LWP
		Mastering Perl/Tk
			Learning Perl Objects, References, and Modules
			Mastering Regular Expressions, 2nd Edition in Adobe PDF format