I spoke briefly a while back with a company/garage called Chizfab not far from me. BMW's and drifting seem to be their speciality and they fabricate a few performance enhancing parts for the E36. The rear camber arms seem to go down well (of which I will be ordering a pair of) but I had mentioned, in passing, the possibility of making me an x-braces which I heard had been done before. It was said that if there was enough interest to make it work their while a batch could be made.
Soooooo I though that it might be worth a mention to drum up any interest! . Now I have no idea what they would charge but I reckon I wouldn't be too far out of line with what a normal one would cost you and I have no doubts about the quality being anything other than spot on. Oh and they'll powder coat it in any colour I believe!
If there is enough curiosity we'll see about getting something started, looking for about ten for starters?