All the other sets you can buy the two implants/relay with merc commendations. With the force-master set only two items are for sale with the merc commendations...1 implant and the relay.
I am confused by all this. I didn't get to Belsavis till level 44, and I have done 0 pvp and 0 space combat. I just did all the quests. In fact I have been overleveled for everything since I left dromand kaas. 0 grinding...all questing...works fine.