A 5000 foot long roll of plastic is common. Here is a 50 inch wide roll that is over a mile long which costs $400:

https://www.mcmaster.com/19575T43

Or here is a 20 foot wide roll 1/10th of a mile long: https://www.uline.com/Product/Detail/S-20063/Plastic-Sheetin...

Based on the cost of the roll from McMaster, a wider roll with the same cost basis would be $2000.

I worked briefly in a factory where they had these giant rolls arriving daily... they were put onto a machine that would spool them off onto smaller rolls (say 100ft) and chop them. It's definitely something commonplace.

Rolls like those were common in the warehouse at the place I worked.