I have a set of Gojyo production sketches from the Saiyuki 'Burial" OVAs, specifically the Gojyo/Hakkai episode. There are 18 original hand-drawn sheets. $25.00 for the set, plus shipping.
There is one close up of Gojyo's face, one of his back, one of him falling (I believe when he took Banri's place and was tied to a chair and hit, before Hakkai showed up. There are two kind of hilarious headless shots focusing on Gojyo's crotch area, and then a bunch of super exciting building drawings and random floor tiles and/or ceiling tiles.
These are the good ones:
These are the super exciting ceiling/floor tile pages. HAND DRAWN, PEOPLE! Have ceilings or floors ever been so exciting?
These came in the set as photocopies, so they are NOT original drawings. I can't tell if the notations on them were hand written or if they were photocopied with them on there. They're pretty gorgeous anyway. There are 8 total of these.