hyperform racing is right.most manufacturers are using component grade carbon fiber(fibers layed at 0 and 90 degrees).i am using quasi isotropic on all of my kits and it is very stiff.i have been using it for the past 2 years and have had alot of success with it.the reason quasi is more expensive is because the fibers are layed at 0,90 and 45 degrees which means that there is alot of wasted material because of the sheet corners get cut off on the 45 degree layers.but with the quasi isotropic material you get incredible torsional strength.however,i have been experimenting with different types of carbon fiber and i am actually having panels made now that far exceed the strength of the quasi isotropic i am using now.unfortunately it is quite a bit more expensive but being that i do not farm out my work,i should be able to absorb most of the costs.
there has been a shortage in carbon fiber.apparently the government uses alot of it and they get first dibbs on it and they did demand alot of the raw material which did hurt the availability of it.im sure it will let up in the near future but it kinda sucks for right now.