A Dropcam will run you about $150. Price out a Raspberry Pi, camera sensor, and a CCTV camera housing found on eBay, and it starts to look like there may be a cheaper replacement for a Dropcam sitting ...

A maker in Texas has built a security camera for his farm. It has been built from scratch, including a 3D-printed case housing and the main controller circuit is a Raspberry Pi with compatible camera.

Yes,we learned that we can take mobile phone camera modules from almost all mobile phones to inteface them with our advanced hobby electronics projects just as with any other standard add-on modules.