I was able to find some RPi cameras on eBay for about $8 each, though they weren't NoIR. I also found RPi ZeroW for the official price of $10 (from pishop.us) a

I was able to find some RPi cameras on eBay for about $8 each, though they weren't NoIR. I also found RPi ZeroW for the official price of $10 (from pishop.us) and that combination worked well as an open remote cam for me.