Try to use all one size 4X8 sheets so you can use every piece, I used pretty much all 3/4 and stuck two pieces together to make the stringers.Gran is probably pretty close in cost, shop around for the coosa. Composite 1 is about the cheapest if you don't mind the drive and can set up an account.Capt Matt
It was crazy how much I saved by using composite one compared to buying stuff from my local fiberglass supply store. A little more than 1/2 the price on the coosa sheets and the cloth was cheaper but not by much. Even with gas for the drive to lakeland twice as I did not have the cash flow to buy it all in one shot it was a no brainer. You can smell the fiberglass resin there from a 1/4 mile away.Capt Matt