On Apr 14, 2008, at 9:49 AM, alan smith wrote:
> Probably too expensive and physically large

Are you completely set on a piezo sounder?  There seem to be quite a  
large quantity of the "ring tone" sounders from cell phones available  
on the surplus market, and they seem to be tiny, impressively loud  
for their size, and cheap.  But most are electromagnetic rather than  
piezo based.  Here's a representative device:
http://www.goldmine-elec-products.com/prodinfo.asp?number=G13780

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