surrounds for my C2s & AC300

I am trying to find surrounds for my Energy's without breaking the bank. I know the correct application is the RVSS surrounds from Energy. I can't seem to locate them except from Audioexcellence.com which has them at $439 plus. Is it really necessary that I have these as my surrounds or can I substitute them efficiently for a lower price surround setup? My room is not that big and I am powering them with a Sony DA4ES.


As always, thanks........................ Tom