Keep looking on the auction sites. That's 
probably your best bet. Occassionally a cel 
from Gunnm will show up there... I can think of 
a couple that showed up on Ebay and a few 
that showed up on Yahoo Japan within the 
past six months. Cels from this show are 
usually hard to come by, expensive, and 
treasured greatly by those who collect them. 
Best of luck!!!