I didn't see any other English speaking fellowships dedicated to Espionage. With my current membership level, I can't join the fellowship or even read the Espionage Freaks discussion board messages.
Dark Prince: I can't either (I'm not a member), don't worry, that's not necessary to play in the League's tournaments. It's a shame one can't join fellowships without a membership though.
Chaos: I would say membership isnt so expensive. If I remember good it is cheaper than IYT and there are couple of action during the year where you can buy two years of membership for prize of one year.
Dark Prince: Nothing much discussed on the freaks board. This is the main board that everyone posts to. Regarding fellowships, this is not a concern unless you want to play in team tournaments. There has only been 1 team espionage tourny to my knowledge.