A dollar each? I'm thinking, bolt about twenty inside a large brass bowl, for a steampunk/madsci thinking helmet brain massager.
Well, actually that wasn't what I was thinking. GIANT VIBRATING FLEXIBLE SLUG COVERED WITH HUNDREDS OF THESE, crawls along by asymmetric vibration. Put in art show.
(((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) William J. Beaty SCIENCE HOBBYIST website billb, eskimocom