The TV series was done with CG, so there aren't 
any cels for that.  I *really* want sketches 
from the TV series, but haven't seen any turn up 
yet.

The OVA was done with cels, and occasionally 
production and repro cels turn up from that.  
Usagi's House (www.usagis-house.com) currently 
has a few for sale.  I think animegame.com's 
currently sold out.  I have two repro cels 
(they're numbered with a number only, no letter) 
in the Misc section of my gallery, but they 
aren't for sale.

-Pasiphae