I brought a couple of these when they came out, around 7-8 years ago I guess.  I installed one and this one was left over.  Still has the original seal on the box!  You do need a neutral wire in the socket for this to work from memory.

No idea of the value as they are not available in NZ anymore.  Amazon have them for $56 + shipping, so how about $50 including free shipping in NZ.  Or pickup in Auckland.