Jinkies...I've never seen a Nemo cel anywhere, 
not even in leet classical galleries! o_o; I 
doubt you'd have any luck on the various online 
shops for the most part, but I know some places 
like Mangaya who are stationed in Japan and do 
custom orders. Only drawback is that they expect 
you to buy it once they find it for you, even if 
its not the precise depiction you might have 
wanted ^^;

-Nall