As far as I know, these are now unobtanium. You could try the eddy yahoo group
https://uk.groups.yahoo.com/neo/grou...io_users/info; Ian Nutt has many spares.
If you find a source, let me know...
WARNING When used on the AC mains power supply, these connectors are unsafe.
There's lots of info the EC10 and all Eddystones on on
http://eddystoneusergroup.org.uk/
cheers
JohnB