In my opinion, the price depends of the 
shots,timeing of the cels shows up and the 
present of any other cel collectors.

Actually I got one of the Quatre OP cel with 
sketch last year, I'd paid 2/5 of the price of 
the one showing in Yahoo Japan now... 

So, I just think there's no trends of the GW cels 
you can make a hold on...

Let's make a guess, how much will the following 
signed GW Odd Number series  cels will cost?
(I'll tell you the actual amount I spent later, 
just guess it first)