Pi Zero W
From Wildsong
I have a Model B without the wireless features and wanted to play with a camera so it made sense to invest $10 in a Pi Zero W.
Since it's the first one for me I got the cute C4Labs Zebra Zero+ protoboard setup from Adafruit at the same time.
If it works out and it's fun I will set up more Pi cameras.
Camera notes
MotionEyeOS https://www.raspberrypi-spy.co.uk/2017/04/raspberry-pi-zero-w-cctv-camera-with-motioneyeos/
MotionEye on Raspian https://www.techcoil.com/blog/how-i-setup-a-raspberry-pi-zero-w-cctv-camera-with-motioneye-and-raspbian-stretch-lite/
Built into a dummy camera case: https://www.instructables.com/id/Zero-Security-Camera/ Pi Zero (not wireless) + USB - LAN adapter
Cool 3D-printed case: https://www.thingiverse.com/thing:2544275