I'm going to bring several cardboard fabric tubes to the launch on Saturday. They range in length from 4 to 5 ft and I.D. from 1.5 to 2.25 in. Some are in good shape and some have kinks. They are free for the taking and I'll put them somewhere near the RCO table.
I've made two rockets with previous tubes and both fly well. I'll have one with me on Saturday.
Claude
In the interest of full disclosure, I kept 3 of the really good tubes for myself!