For about $300, you could get a button maker and a whole bunch of
button parts and instead of putting pinbacks on the buttons, put
magnets (the button company sells these too) If you sell these for
$1 each, you'll make back your money in no time! In addition, you
can have the button maker for other things (incentives/rewards). The
one we bought is from Dr. Don's buttons http://www.buttonsonline.com/
model100.html and it's quite easy to use. Each kid could make a
bunch of designs and then make them into magnets.