Well, if you go to Lowes and seek out the section that contains the guttering, you'll find these rolls of screening that are sold to keep leaves and other debris out of your gutters. While it isn't advertised as such, it is number 8 mesh. Here, as everywhere I assume, it comes in both a plastic and metal varity ... the plastic is somewhat cheaper and is what I bought. The big problem is, although you get many feet on a roll, the stuff is only five or six inches wide at most. When making my SBB, I cut several pieces and stapled it to my frame - then I stitched the sections together with fishing line to get it tight. For many other applications it is plenty large enough - using it with feeders for instance. I wish I could quote you a price, but I am pretty sure it is six or seven bucks.