I got weird reactions in the eastern United States when I used the term swap meet.
"What? A place where you trade beef or something?"
"No, a place where you meet to swap things. As far as I know, it started with California hot rodders wanting to trade car parts. Now you can buy all sorts of things there."
"Oh, a flea market."
"What (I joked)? A place where you buy bugs?"
Thanks to Californians coming to Baja, they say swap meet here. There's one every Saturday north of town, by the recreation center of a gringo real estate development.