I've made a couple of these for grocery shopping and keep them in the car. Unfortunately, I keep forgetting to take them in when I shop! I made the largest size to take all my stuff to classes. I've bought the mesh at quilt shows and when I visited friends in AZ at Zoe's Trunk shop. I do find the mesh is very slippery and moves a lot when you sew it. My lines of stitching aren't the straightest because of this but for me they work just fine.
If you just want black mesh, I found pet screen at Wal Mart at a good price. Can't remember how many bags I got out of the roll but I did make one for my sis, her daughter, and me out of it for sure.