Hi:
Silly question. However, don't Maplin sell these? When I was doing my GCSE electroincs course (10 years ago) I had no problem sourcing some fairly obscure components from them. However, this was before they made the bright decision to turn into a toy shop selling battery powered remote control boats and the like.
If not have you thought of befriending a teacher who might have access to educational supplies catologues and could order you a few bits?
Thanks
Graham