I purchased the a large roll and it was dispatched the same day and delivered within 2 days.
Service levels from store are excellent in my experience.
I required this mesh mostly for the summer months where a fair amount of these flies and other flying insects (flying ants and etc are active). These certainly keep all of those out.
Simply cut this to size and fix it using 3M Magnetic tape to your window or opening and you're done. Now you can leave your windows open and not worry about those larger pesky insects flying in at night and your room gets fresh air.