Oh my, subject next to our hearts...we have done them all within about 60 miles, so here is our advice...
Best and closest is 192 Osceola Flea Market...Friday, Sat, Sun until about 4PM. Do not be fooled by the ones that are open everyday along 192...they are not he real thing.
Osceola is way way east on 192...about 10 miles from Disney. Once you pass under the tollway it will be on your left...big pink sign...lots of booths with all kinds of stuff. I have seen lots of booths with cars and some Star Trek stuff...be sure to check out the small booths at the far north east end that have a little sidewalk in front of them...these have lots of old toys and cars in them.
The big one at Webster on on Monday..."only show in town" on Monday and it is packed...closes as early as 3:30, and starts like 6:30 in the morning...so if you want the biggest of all, this is it. (you can google webster florida flea market for lots of info)
Renningers is huge too, and they have a web site also...
The one on 192 is the easiest to get to...again, don't be fooled by the ones on 192 just east of Disney that call themselves "flea markets"...the real one is all way out on 192 and just 3 days a week...
Enjoy...Ted