I'm looking to purchase a P4P standard transmitter.  Preferably a refurb.  I recently purchased the P4P+ and love the simplicity of setup and the ultra bright screen.  Yet there are times where I would prefer the use of 3rd party apps.  

Are there any P4P standard transmitter refurbs available, do we know how much they are?  Should I just call customer care?

DJI does not sell refurbished remote controllers. You might be able to find one on eBay.

I read that you can link the rc of the phantom 3 advanced or professional with p4p