you can order them here (
http://www.ballisticpublishing.com/books/oddworld/). You can choose between soft cover, hard cover, and the limited edition. I only took the limited one, but there are fans here that took them all
.
hmm, I now see they have changed the site, go check it out, maybe something interresting to see
. Or did you already know it, because the interview from Xavier and Max is also on balistics.