Okay, several people have posted that they have had gone to the local Lowe's and had plastic rulers (squares, rectangles, etc.) cut for them. Did it today. I wanted a plastic 5"square (exactly) couldn't find one anywhere here in town so went to the window area and they had a 8 x 10 in two grades of plastic. The one (which would have worked) was 1.98, the next higher grade was 3.98. I went with that one. They did not charge me for cutting it and it and I got a perfect 5x5 square. So I had him cut a 4 x 4 and then had a 3 x 5 and 4 x 5 with a 1 x 4 left over. All for $3.98 - better than a coupon. If you needed an 8 x 10 - no cutting necessary and you can go to the next up at a 10 x 12 to get a 10 inch square with a 2 x 10 left over for 5.98. Just trying to keep us all saving a tad bit of money here and there. They can also cut 5 1/2" squares or 4 1/4 or 6 1/2 for not a lot of money.