For flea markets, craft shows you need a product for kids than parents
and grandparents will buy---and products like jewelry for adults so you
get a double shot at selling something to the same traffic.
For the kids, manually-animated or wind-driven wooden toys are
great---here's a few, including the wooden gears and gearmaking
machines, software the toys will need to make and animate the wooden toys.
http://www.sentex.net/~mwandel/workshop/gears.html (cutting wooden
gears on a tablesaw---something you really need to do if you are making
and selling animated wooden toys of various kindes, pull, wind-driven etc.)
http://naturecoast.com/hobby/uacc.htm (Unimat makes a fine desktop
lathe, with numerious attachments to accomplish almost any purpose you
have in mind, including a duplicating follower)