Hero Electronics sell
Optical Transmitters and Receivers for home-constructors who wish to
build convertors. Hero are currently offering the GP1F32T for GBP 8.75
and the GP1F32R for GBP 10.25 or both together for GBP 12.40. There is
a delivery charge of GBP 2.50 for addresses outside the UK:
Hero Electronics Ltd, Dunstable Street, Ampthill, Beds. MK45
2JS phone: 01525 405015 email: firstname.lastname@example.org
If you live in northern Europe, try out Elfa in Sweden. They carry
a tremendous amount of electronic stuff, similar to Maplin UK.
The p.n. for various parts :
75-360-06 TOTX173 Toslink transmitter $10
75-360-14 TORX173 Toslink receiver $10
46-905-33 Square plug $5
55-953-50 Optical wire $4/meter
You also need a 8.2 kOhm resistor for the transmitter.
They also have two mini-size transmitter and receiver modules, which don't
require any plugs, you just plug the wire in directly.