Window/door screen mesh (Loyola Corners)

Hi, neighbors and other friends- we want to cut two or three 8x16 inch pieces from scraps of window screen mesh to add to our house vents. It doesn't make sense to buy a whole roll and possibly make part of it unusable just to get a few little pieces that are probably fairly commonly left over from standard screens. We'd be perfectly happy with useable remains from an otherwise unusable screen. I can easily bike or walk anywhere within about five miles from the 85/Fremont area. Thank you very much!