I made a 138" DIY frame with Seymour XD (AT) screen material. Total cost was less than like $350 for everything. It was nice to get the screen material only right from Seymour.

There are other alternatives. Jamestown is basically a DIY screen on steroids. A friend of mine has a 140" Seymour screen on a Jamestown frame with Axiom in-walls firing through it.

Of course you guys are in Canada, so who knows what your cost would be.
Jamestown Screens

DIY is still cheaper, but having something easy to put together and knowing that it will be perfect the first time without running around to get lumber, supplies, help to put things together, etc has value too. Granted, I didn't go that way. LOL

Farewell - June 4, 2020