You can buy screen kits for canopy's cheaper than you can buy the screening. I just spent the last few days looking on line for them.
The screen kit does not have to be the same brand name as your canopy.
I read the remarks on all of them and found quite a few from RV'ers which gave me the info I needed to screen in my canopy.
Google Shelter Logic and Wenzel canopy's and then search for screen kit.
These seem to be the 2 brands of screen kit that are the easiest to modify for any canopy.
Dicks, Gander Mountain, big box sport stores have a plethora of screen kits in stock.