When I tried to electrify my CBG, I looked around for a piezo element. I figured there would probably be one inside one of those greeting cards that sing a little song so I dissected one to scavenge that piezo.
It didn't have a piezo but it did have a little plastic speaker. I tried that and it worked!
Now I have no idea how it compares to a standard piezo. Maybe the next CBG I build, I'll use a piezo and see how much difference it makes. I just thought I'd put it out there that there is an alternative if you can't readily come up with a piezo.
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yup .. every speaker is a microphone backwards .
you can take a 3 inch or so speaker and tape it inverted onto a parlor guitar , jack it to an amp , and it will act like a mic/ piezo .. etc . some folks use them in stomp boxes .
altho more like a electro mic and less like a piezo , they are piezo-ish sounding . and touchy . ;-)