carbon on most weaves and weights are available from local composite suppliers... check in with the boat building supply chains... I get my carbon from the company that supplies the national americas cup builders crew.
bi-directional C.F. is easy to find, and I've been able to locate a woven double bias tape (biaxial), but a non-woven or stitched double bias (biaxial) tape I have not come across, and I've spent considerable time researching it and trying to locate some. Anyone have a link or source?