Now that I'm back for the holidays I've finally put up a page so people can buy the Learning Perl Study Guide. O'Reilly priced the book at $19.99 (US) and $25.99 (Canada), but its not available through the normal retail channels. You can buy it directly from me for $14 (North America) and $18 (Everywhere else). I'm selling them at cost.
The Learning Perl Study Guide has several additional exercises for each chapter in Learning Perl, 4th Edition. All exercises come with solutions, and I tried to solve most of the exercises in more than one way.