Piedmont plastics (Greenville, SC). Priced me a sheet 1/4 4'x6' for $140.16. I will probably just order that in the morning... They also priced me 2 individual pieces 20"x6' and those would be approx $70 ea. So if you want perfect cuts they will basically cut it any length for you from the sounds of it for little to no extra charge. They did have to order the material and will be a week out on it.
PS, I am wanting 1/4 as it needs to be flexible where this is going. They can get whatever thickness you want.