A range of Piezos are available from RS here. I'm not sure what are the most important features of a good piezo but according to the literature* the full bandwidth for various knocks amd taps os 100Hz-5kHz so a piezo with a good response in this range would be a good start. This piezo may be an option. Here is its spec. A piezo element is available from Farnell but it does not seem to have a spec. Piezos seem to be dirt cheap!
Here is an entry in sensorwiki for piezos with some technical and practical details. Here is a youtube video of an engineer attaching piezo pickups to his acoustic guitar which provides a few practical hints, for example the use of a hot glue gun to attach the piezos.
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