I agree with Ryouko and Tara.

I guess if you decide to keep it, then do so, if 
not, then Ryouko made a lot of good points. One 
offer each person, give everyone a chance at such 
a lovely cel and everything else she said. I know 
there are a few others who would love to get him 
so this way a lot of people get a shot at him:) 
Some who have been searching for one good Nuriko 
cel for a long time. Good luck with the whole 
thing! And everyone who will try for him if it 
goes to auction. 

Heh, I've noticed prices going down on Ebay too-
except... *_* Except for Nuriko cels. *gasps* I 
would hate to see the bidding war on Ebay for 
this cel. Scary...