I used to install alarms systems. So I have installed a few cameras for myself as well. This is the place I was last researching:
https://www.backstreet-surveillance.com
My big problem is making sure it is -20 capable since I am in the mountains. Its not just us mountain types that need that type of temp capable stuff though. I used to get that type of temp out north and east of Kiowa.
Out in Kiowa I had a really high dollar one that was even blast rated and 20x but didn't want to spend that much lately so was researching else.