I was going to complain that your library is obviously better than mine. But then I actually did a search and found that even my relatively small public library system has a large number of books on Perl. While they didn't have this specific book, they could most likely order it from a nearby college's library.

The lesson here is not only that we often forget libraries are a great source of free books, but that you should never assume your library can't get you the books you want.