Availability?

By raynovich, in Zombie Apocalypse

Hello all,
I am mostly a board gamer these days. However, I have a couple of friends who want me to run an RPG. I thought this would be a good system to run. Unfortunately, it seems out of print. Other than getting it on Drivethurpg.com with the bundle of all four books, is there another way to acquire this book? Is the drivethrurpg.net pdfs a good way to go?