Kit for kids?
 

What sort of kit can I get for 6th grade kids to interest them in
radio/electronics? And where could I get same inexpensively (so I don't go
broke if I got a bunch for a classful of kids)? Crystal radio? Something
else? Does anyone have experience/stories of doing something like this with
a group of kids?

Thanks for your time.

73,
Matt Thomas
KD7PPK