As noted above in other posts for other states, in AZ it doesn't matter whether you're in a gun show or not - the rules for each type of transaction remain the same.
I don't know the percentages, but it looks like at least 90% to 95% of the actual firearms transactions at gun shows are from licensed dealers (FFL's) to individuals. So, all the hassle applies - 4473 forms, and either calling in to NICS (which is often 'conveniently' down during many shows), or checking your concealed carry permit (if you have one). The other 5% to 10% of the firearms sales appear to be from private collector to individual - just as you can do in AZ any day of the week, via the newspaper, word of mouth, etc.
Note that the media almost always implies that there are NO transfer requirements at gun shows. And, if the real concern is keeping guns out of the hands of bad guys, then why don't most states institute a Project Exile, like Virginia? Is the point to keep guns out of the hands of BG's? No. The point is to tighten controls on honest citizens, using the BG / gun show argument as a veneer.
The gun show hysteria is a red herring - they are really after private transfers, and the bastards are making headway. After killing private transfers, then they have effectively imposed registration for essentially all future firearms transfers.
And then .... well, see
http://www.sksbuyback.org . Yeah, we're paranoid ... we think states are starting to confiscate firearms based upon the lists they keep.
Regards from AZ
ps - and here's what David Kopel has to say about gun shows, and David is a brilliant guy:
http://www.nraila.org/research/19990716-GunShows-001.html
[This message has been edited by Jeff Thomas (edited December 13, 1999).]