Cost of Carbon. I was able to purchase a roll of 12 inch wide 9oz unidirection cloth for $600 canadian (about $400 USD)for 100 meters. An A-Class mast uses about 6 or 7 layers of 12 inch wide fiber plus another 2 layers of 2 inch wide strips on each side. THe 6 or 7 is based on how heavy the guy is and determines the mast stiffness. So the carbon uni cost would be about 240 feet at about $1.30 USD per foot. You would also need about a gallon of resin for around $100 USD. Thus the tube cost is not really all that bac if you have a mold. It gets expensive only when you are on your 2nd, 3rd or 4th try and keep screwing it up. Make no mistake, it is not that easy to make a good wrinkle free layup, unless you have lots of help and lots of experience. The beams i made for my A-class do not look so hot (but they work).