Try looking around on the links in www.cels.org 
since there are a few sites with Shadow Skill 
cels that I can't remember.  But off hand, I know 
Art Shop Rose (http://www.rosearts.com/rose/) 
some of Elle.  They are from the TV series, 
though.  I haven't seen any cels from the OAVs 
for sale in a long time.  I know I'd love one of 
Scar Face from the first OAV.

Laters,