Hi, anyone know where (or if) I can get some of those cheap shock sensors 
you see in toys, eg. the rubber bouncy balls that light up when bounced?

The sensors are a basic switch consisting of essentially a spring around a 
central metal pole, when hit hard enough the spring will move far enough to 
hit the pole, completing the circuit.

I was looking into using accelerometers, but I don't know if I can justify 
the cost for what I want to do.  i only really need two or three sensing 
ranges; anyone know if you can tune these spring contraptions, say have one 
ultra-sensitive (picking up the item, bring it out of a sleep state), one 
mid-sensitivity (moving it with a few g's), and one low sensitivity (item 
running into something with a fair amount of force).

Are these things available in low (10s) volumes, or would they only be 
available in the 1000+?

Any help would be appreciated, or suggestions for other cheap methods of 
detecting the required happenings!

Thanks
Lee
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