He has released two other sketchbook before a while back, and now he has a new one available for purchase. This sketchbook contains various excerpts from his sketchbooks and lineart. 24 pages of killer illustrations. The book is limited to 100 and it looks like the cover can be either yellow, blue, purple, red or green.
If you want to pick one of these up, head on over and grab one before they are gone.
Rigamarole 3 Sketchbook