It wasn't too long ago that .38 SC ammo was being made, and maybe it still is. It was, and may still be, popular among the ICORE competition shooters who like to use it in .38 Special revolvers. You might check the ICORE webpage. Also, have you checked the usual internet ammo sources? I came into several hundred rounds of new .38 SC brass five or so years ago, and like to use .38 SC in my .38 snubbies (they have short extractor rods), as the empties eject more fully than .38 Special. The cases are very close to .38 S&W, and I imagine that they could be made by resizing .38 S&W brass, but I have not tried that. Shortening .38 Special cases is another way, but entails a lot of labor.