Not OP but frigate works with any camera with RTSP. You can get Amcrest PoE cameras that are great quality that are around $50. Works without wifi or an app but someone in HN posted that the newer ones need an app? But I haven’t come across one and the newest one I got was about six months ago.
Frigate was a bit limited in usefulness until they added OpenVINO and TensorRT support in April. Trying to find a Coral TPU these days can be a bit of a challenge.
I did a clearout recently and gave away 5 Xiaomi Xiaofang cameras that I'd flashed with samhacks firmware years ago, but never gotten around to using.
If I'd known about Frigate, I might have kept them. But I guess there are better cameras available now?