NP, I went online and did a calculate price and it still looks like it would be less than $5.00 to mail a full sheet in a tube.
I'll have to dig around under the futon (where I stuck all the large paper that I have) to see what I've got. I know I probably have one or two sheets of that heavy Arches type paper and I have some Canson Mi-Tientes colored drawing paper and some other stuff. Now that I know it does not cost too much to sell, maybe I can sell it all online! Thanks!!!