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The cheapest way I found was getting some TP-Link Tapo cameras that have RTSP and Onvif, and run them under frigate.
Set them up in the app, cloud and all, then add them to your frigate, now block internet for them.
Those cameras are anywhere from 25 to around 50 dollars each. Best bang for the buck I could find.
That’s what I did on my wife’s pc, and she’s had no issues with the dual boot BS Windows has created.