This screw head video camera can be bought on Amazon...dirt cheap, but bring your own processor, sensors and storage. Raspbery Pi can handle it.
We are so screwed.
Yes we are. Video surveillance technology is in that same curve that we saw with digital photography during the 1995-2005 period. In that period of time, we went from relatively expensive digital cameras that shot inferior (to film) quality photos to having tiny cameras built into cellphones, as just another feature, but with sufficient quality to put Kodak and Polaroid out of business overnight.
There are now more photos being taken each day than all the photos combined in human history prior to 1980. Granted, a lot of them are teenage girls taking cat pictures, but still.
It is now prudent to assume you are constantly under surveillance once you leave your house. And one cannot even be sure that you are safe from surveillance inside your home!