Michael --
You've hit on a good way to spot what's "hot".
You can do the same thing at trade shows (the ones held in big convention centers.)
See what tables have BIG groups of people trying to get information of sign up for something.
And, now that I think of it, I've been at trade shows where people have been flocking so see...
The same products on your Flea Market list!
Good spotting!
-- Phil
Product Exchange