One quick technicality, I can't list items as in stock and $0 on this site, so it's listed at $5 right now. Call it a donation. However, it's not necessary. Use the coupon code: BROKE and you'll get $5 off on the PDF, so back to $0. An imperfect system, but it's there. So if you haven't taken the time to check out Black and Green Review, here's a pretty easy starting point.