AMG OAV cels will likely to continue going up
slowly.  All the current OAV cels in the market
are from the collectors.  Since the OAV released
many years ago, the cel prices only go UP.

About the AMG movie cels, it'll probably depend
on how popular the movie turns out.  So far, I
heard good thing about it, so the cel prices will
likely to continue to go up.  Unless you have
a lot of money to spend now to bid at those 
Yahoo auctions, hold on for a few months, 
I expect the studio, AIC will probably dump a lot 
of cels to the market within the next few months.