Roofing sheet of various materials eg corrugated iron (New Costessey NR5)

Hello
Thank you for reading this.
I am hoping to be given some surplus roofing sheets from 4 feet long up to 6 feet long in order to make a small wood store.
The materials could be corrugated iron or the twin wall plastic roof sheets or something similar. I can't use the thin single layer of corrugated plastic as it's too weak for my purpose. From within about a 6 mile radius of New Costessey or NR5.
Kind regards Simon