I'd start with these guys.
Realize a screen doesn't know its on a Trillium
or a residential home. Back in the day when we bought a new house, screen companies would canvas the entire subdivision, offering to make screens for every window, at a reasonable price. Buying the supplies and doing it yourself is tedious work. I've done it on repairs, replaced the screen material that was torn on a couple of windows
No experience with this company, they seem to have great reviews. Myself, generally when deciding which company to do a job, I want one that specializes. So a screen company tops a window company. Someone who builds screens every day will have the tools and supplies to knock out whatever I need in an efficient fashion.
Its not about someone carrying a screen already made, its about taking a few measurements and making the screens for you. Let THEM take the measurements!
Edmonton Retractable Screens - Screen Savers Plus of Edmonton