Buying flours in bulk? (Anything but amazon...)

Hey everyone! I am looking for where to buy BULK flours - buckwheat, oat, potato, teff , fine, brown, rice, etc. - but I do not want to buy them from Amazon. My resolution in 2025 is to spend nothing via Amazon to try and vote with my dollars for smaller companies and makers.

I know it will be a little bit more expensive, but I just can't stomach funding the big corporations anymore.

Thank you so much for your recommendations! I love this community.

Recommendations for where to get bulk mixes are welcome to, but ultimately I want to find a place for the single ingredient flours. If I have to source from multiple suppliers, that's totally OK too!

EDIT: Wow! Thanks everyone. I've got some 10 or so leads to chase down. I'll report back. You all are wonderful ☺️