A great question and I would assume the end of the show period would net the best deals as well. Is there anyone that has sold at shows (e.g. Len-2A) that can confirm that theory?
I've never sold at gun shows. Those I worked was as a volunteer for GOAL. Those that I attended was strictly for the fun of cruising thru the show and IF I found something interesting, that was a bonus. In 38 yrs I've bought 2 guns at gun shows, some ammo (really very little vs. what I bought at Four Seasons alone), some mags, books, misc. accessories. It's been many years since I worked a show on Sunday . . . vendors tend to pack up at 1PM and I found the afternoon a drag, never personally found deals just before closing time.