Ooh, big club actions can be really great!...& sometime a bit dangerous, lol. IME, at other club mega meets, go early for most selection &/or stay late for bargains. They can be a lot of fun! Don't be shy, talk to people! Ask questions!
Will you be going Dee? I think it's your local club. What are you bringing, anything? Something extra cool? I got 2 species/varieties of apistos, a pair of killifish, some cool red cherry shrimp variety & probably some other good stuff like plants & equipment...None were planned for but were great!
You probably have to be a member to sell things but almost all clubs let you buy without joining (bring cash!). All I can say is check it out if you live within a hour or so, a fun fish day out! There might be cool restaurants or LFS nearby. Or maybe the club is selling a good lunch? In MA mine sold sausage & peppers very reasonably priced & beverages too. & there were 2 or 3 fish shops nearby, so fun!