mission fs series????

I am looking to buy a pair of mission fs speakers and use them as rears, are they available in singles or only with a sub?? In the store here in Iceland they only sell a system with 5 speakers and a sub, if they sell the flat speakers seperatly there do you know what they cost? And also, I can plug a normal speaker cable to them cant I, or do they have to have the special mission one, because I have cables thred though the walls here. Thanks