poly strip USA Can't find a source cheaply for sure

I got the hit by reading up that some people used the strips used to pack crates but honestly these days the white stuff is not used very often anymore I looked through the whole home depot at there pallets of stuff and the best I found and snagged was like maybe 18-22mm wide. So does anyone have any hints for me.
Not much money available these days so try to focus on hints that can be found fairly cheaply.
terramir

For my first machine I cut them from polypropylene A4 binder covers. For the long X one I stapled two together. Anything with a living hinge will be made from PP.

We bought large sheets intended for laser cutting. They are not expensive but postage is for just one sheet.

Edited 1 time(s). Last edit at 08/05/2016 04:45AM by nophead.

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[www.hydraraptor.blogspot.com]

Some things in that post are not clear, what is a living hinge.
Second you said you cut it from sheets intended for laser cutting, was kind of supply store am I looking for?
terramir

See [en.wikipedia.org].

A store that sells sheet materials for laser cutting, e.g. [hobarts.com]

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[www.hydraraptor.blogspot.com]