Only one item (well, a set, actually) ever 
posted on sale (as far as I know): HANKEN MONO 
(used for official promotional items) genga of 
each of the Aucifer band members.

Sold on E-Bay (Item #1062179221) by Usagi's 
House (correct me if I'm wrong) for about $680, 
I recall.

The proud owner is a regular on this board, but 
it's too late at night for me to recall exactly 
who it was (although I'm sure she'll make 
herself known shortly) or track down her site.

I could post the image but it's better if the 
owner does so herself.

If I were you, I would commission a fan artist 
rather than try to hunt down production stuff.  
Fan artists these days are better off producing 
cel art for digitally-colored anime titles 
anyway; there's probably a better demand.