Where can I buy a thin transparent plastic sheet that can be used to over a computer monitor or laptop monitor

It usually comes with new laptops or certain computer monitors. Its thin and flexible and can easily be cut and taped in front of the monitor to stop dust from collecting. I tried Office Depot and the closest thing they have are laminate paper, but it's too small. I need one about L:9 inches and W: 13.5 inches. If you still don't know what I am talking about, what I am looking for is like the plastic sheets teachers use to write on when using an overhead for their lecture. Hope someone can finally answer me.Where can I buy a thin transparent plastic sheet that can be used to over a computer monitor or laptop monitor
Hardware store, art supply store? I've seen plastic sheeting on 3 foot wide rolls.





But, that may keep the dust off your monitor, but what keeps the dust off the plastic sheet? Another plastic sheet? And that one?

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