For your consideration is an Infant Optics H100C Wireless Camera Replacement Add On.  The item shows some general signs of use.  The unit came in a box of misc electronics.  I don't have a way to properly test the unit, but it does power on.  I recently sold this camera's brother, and the buyer messaged me, and told me that it worked fine, so there's a good chance it works.  If you find though that it doesn't, feel free to return it.

The item ships with USPS.  Please let me know if you have any questions or would like any additional photos. Thank You!!