You can buy 1000 thread count sheets online from stores such as Macy's and Bed, Bath and Beyond. You can also find these sheets from retailers such as Amazon and Overstock.
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You don't count the door and window. so, 13 / 4' = 3 1/3 so you will need to buy 4 sheets.
There are sheets you can buy at craft stores, where you can cut them into the shape you desire. Or you can print the desired shapes on to the sheets using your printer.
the 500 sheet
You need 63 sheets at 8 by 4 sheets. There will be some waste so buy a few more.
A sheet of plywood is 4' x 8'. It would take 2 sheets long (16'), and 4 sheets wide (16'), for a total of 8 sheets, with some scrap left over. Since you can't buy plywood in other sizes, really, it would take 8 full sheets.