Synth Zone has links to Stylophone websites, so I'll include them here.

Rolf Harris used to use one back in Australia.

A brief history http://web.archive.org/web/20020314060850/members.aol.com/normleete/keyspage/dubreq.htm

You can still buy them here http://www.stylophone.com/

A free VST Stylophone plugin http://www.kvraudio.com/get/68.html