I think it was HMV I saw them in.
Edit or various places on the net seem to be selling them for a tenner:
www.find-me-a-gift.co.uk/stylophone.html?gclid=CLuenZXViZYCFQ0yQgodul3qEA
( ,
Fri 3 Oct 2008, 0:09,
archived)
www.find-me-a-gift.co.uk/stylophone.html?gclid=CLuenZXViZYCFQ0yQgodul3qEA