Hmmm - yes
You can find a 10 M cable here :-
http://www.keene.co.uk/cgi-bin/codesearch.pl?DDV10
and a 20 M one here :-
http://www.keene.co.uk/cgi-bin/codesearch.pl?DDV20
They are both 6 pin to 6pin so you will need two of these adapters here :-
http://www.keene.co.uk/cgi-bin/codesearch.pl?43100
BUT - I should warn you if you are expecting to use that for your digital camcorder you may well suffer considerable signal loss and have poor picture quality. What you should be using is a number of these :-
http://www.keene.co.uk/cgi-bin/codesearch.pl?DVREP1
to connect together shorter lengths of cable
I believe Keenes supply around most of the world and I would think they would send them to Sofia with its Church of Alexandra Nefski and the beautiful nearby Rila Monastry