An unofficial survey indicates many Miamians (well, at least three or four) do not buy anything, except groceries, anywhere but this flea market. Why run around to different malls and spend more, they reason, when on any given Sunday afternoon they can take Mom and the kids out to the pulguero (that's what the thrifty souls in the survey call it -- Spanish, you know, the preferred language of the majority of the sellers and clientele), plop down 50 cents to get in, a few more dollars for sodas or sno-cones, pick up the underwear or socks or mattress or kitchen table they need, and make a nice outing of it. A little extra change and you've got a stuffed bear that dances to merengue and a stunning pair of green plastic five-inch platform sandals. For today's busy American, this is where you get more for your dollar and your time!