Book price?

So this show has been on my watch list forever, finally got around to it and it was great! Awesome show! found out that it ends with a book. That's cool. I like books. But either my online shopping skills are failing or it seems to be like $125 everywhere. Like, that's an expensive freaking book and I've bought small print graphic novels before. I live in the developing world so it's really freaking expensive. What's up with that? Is there gonna be a paperback or digital release eventually?