Is this too big? I have not used it, but the price seems good, and it would be durable.
http://www.sparkfun.com/commerce/pro...oducts_id=9480
Or use a piezo speaker, and buzz out each digit.
Then if you want a little more difficult, have it talk the numbers out with Roman Black sound. See: http://www.picbasic.co.uk/forum/show...0131#post90131
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