I had the same problem locating it here in PA. Found out almost all electrical supply houses carry it. Look in your phone book for the closes one and start calling. I got it from the first I called, right down the street.
I purchased mine from a building supply dealer. Home depot didn't have it. They didn't know what I was talking about until I pointed to the unistrut that was supporting the large fans and hanging metal halide light fixtures overhead.
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