I would also suggest looking under these links 
(it required a little leg work but sometimes
the titles on the cels do not mention cels or
do not mention the name of the show)

Listings in the cels section:

http://list.auctions.yahoo.co.jp/jp/2084005356-
category-leaf.html?alocale=1jp&acc=jp

Listings if you just search under cel picture
http://search.auctions.yahoo.co.jp/search/auc?p=%
A5%BB%A5%EB%B2%E8&alocale=1jp&acc=jp&hc=0&hs=0