Just out of interest what cloth were you using to work out your costs?? For something like this you would really need a lightweight cloth & this is where the costs spiral, not just the fact that they cost a lot more to start with but the fact you need 2 or 3 times the length to achieve the same laminate thickness lol.
Don't hold your breathe waiting for costs to come down, because there is less demand for certain types of cloth less of that type of cloth is woven so costs will always remain that much higher.