Clear plastic for windows

We have a very cold north facing porch that never gets any sun. It is 7 foot screen panels on the entire north wall and this is a house that we are renting. Since our dinning table is there we would like to cover the screen with clear plastic as our way of enclosing the room. I know that it is trashy but eating breakfast at 60 degrees is too chilly for us. Does anyone know where I could purchase clear plastic? Thanks

The ferreterias have it on giant rolls you just tell them how many meters you want. It's very wide. Should be fine for what you want, I found out the hard way that it's not so good for outdoor use for any length of time, the sun has it's way with it. It's not exactly clear. . .

Thanks,we will start measuring!

A Cristaleria (sells everything kind of store) here had rolls of heavy stuff that I made windows out of for my upper laundry room. Only a little over a meter wide but I have small windows.  Made a wooden frame and stapled the plastic on