I've had a number of experiences where I've seen 
groups of same-sequence cels suddenly crop up for 
sale from different sellers, all within a week or 
a month of each other. I can think of three or 
four cases since last October off the top of my 
head where two, three, four different vendors 
suddenly were selling nearly-identical cels. ^_^

It's actually kind of funny when it happens, 
especially when you're not fortunate enough to 
snag the first one you spotted cropping up. :o)

-Cres