In reply to springfall2008:
Wild Country did make Rockcentics on wire, as well as dyneema, when they were first introduced but they were quickly discontinued. That's many, many years ago now.
I've tried all sorts of gear over the last two decades and after realising that a Rockcentric size 6 was a useful addition to my selection of large wires, I've since stockpiled a couple that I acquired second hand. I've met at least another climber who's done the same thing and bought a complete spare set second hand.
Other than going with the BD Hexes which can be useful, (one of my partners has a couple of medium sized ones on his rack,) keeping an eye out for some second hand Rockcentrics is pretty much your only option.
Post edited at 19:33