I have two different ones in the system right now (around 14 cameras total). Amcrest and SV3C are the brands and both are available on Amazon pretty cheap. I have a mix of 5MP and 4k cameras where it makes sense for better details etc. I also have a mix of the bullet cameras and the bowl versions.

I am pretty sure the SV3C brand is just a rebranded Dahua or similar, just a little different software.

FWIW: I also never use their mobile app to set them up, I just plug them into the isolated network and use the web interface to configure them.