I got this artbook, and it's really great, but I was surprised to see that the calendar illustrations weren't in it.
Literaryeagle, who also posts on this site doing Eva book reviews, informed me those are only in the limited edition of the book.
I don't know for sure where you can get that one, but I believe it's on the Eva Store, which doesn't ship outside Japan.
Literaryeagle knows because he owns a copy and will do a review soon, but I still felt morally obligued to warn about this ASAP I guess.
I can eventually get the limited edition, but this is still kinda disappointing since I looked forward to that art.
Edit: The same goes for some of those Anno lamp illustrations.
Shinji: "Sooner or later I'll be betrayed... And they'll leave me. Still... I want to meet them again, because I believe my feelings at that time were real."
Ryuko: "I'm gonna knock ya on your asses!"
-Asuka: THINK IN GERMAN!!! -Shinji: Öh... Baumkuchen...
Hayashida: "As game developers, our work is special. All of us here can put smiles on very many people's faces with our work."
"In any case, it (Kill la Kill) is the greatest work of fiction ever written and should be taught in schools." -Squigsquasher
~('.'~) (~'.')~ Dancin Kirby