I've seen on a wire company website that they make a special kind of cable designed to eliminate shared neutral, allowing it to work on GFCI/AFCI protected circuits, or otherwise eliminate those shared neutral issues. The cable is described as having, in addition to the bare ground wire, a black wire, red wire, and two white wires, one of which is striped with red.

But actual catalog pages and price lists I've downloaded don't have this stuff at all. I'm interested in finding out how generally available it is across the country (not just in my own area, which I could find out from an electrical supply place I'm sure). That and which manufacturers make it.

This would just be three-phase cable with the blue wire replaced with a white wire that has a red stripe. Couldn't they have just tweaked the code to allow marking blue as the 2nd white in this special instance? Or would that be too confusing?