Cels Forum

My reccommendation to you is to search for the cels you want on
your own.  There are many collectors out there that are looking
for the exact same thing as you are and will shamlessly wave what
they've got in your face until you wanna cry or beat them to death.
Check the Anime Cel guide http://www-scf.usc.edu/~ckawakam/cels
dealers daily.  Familiarize yourself when each one normally updates
and systemicly check them.  You will have a much better chance at
obtaining what you want this way. Of course there are cel dealers
that make totally random updates, so it's basicly like playing
roulette with cels. 
Oh and though people here normally post their wants, I don't think
that it's a good idea, as some people will see it as a money making
opportunity and buy up the cels you want, then try to sell them to
you and/or others at a substantial profit.  Also cel prices are
based on supply and demand; the more people advertise they want 
certain cels, the higher the prices will go, as the greedy will
realize there is a market for them and jack up the prices.