Never having been to a con, I'm interested in how 
it works.

What form of payment do the dealers require at 
these shows? Do they take credit card or do 
buyers need to carry cash, sometimes in the 
thousands of dollars? 

Also, how are cels traded? Do people bring their 
most valuable cels to the exhibit hall and carry 
it around to dealers? Are there prearranged 
facilities for trading at the cons? 

Thanks,
Chi