I remember reading years ago that in the future there would no longer be non-GMO seeds. I didn’t think anything of it then. Now, I pray that what the article said about some groups safeguarding those seeds was true.
There is an org called Seed Savers and I’ve ordered seeds from them. There are also many other seed companies that sell only heirloom/non and non gmo seeds.
https://www.seedsavers.org/catalog