What you guys think of Arcade card (see them all the time on eBay), like is there specific sets like trading cards or are they more like Postcard where there is no definitive end?

Claude
Arcade cards are a separate division under the album card category. Album cards were issued for collectors and sold as cards alone. They were not sold with candy or gum or cereal like the standard collector insert cards.
There are many fine arcade card sets from Exhibit Supply, Mutoscope and Evans; and there are also some very serious collectors out there.

there are a few actor/actress cards that I try to collect.

here is a recent pickup..