Netgear makes a powerline adapter set with built in airplay support (powerline adapters uses the home power line grid as your network grid)
The specific model is xaub2511
Just picked up one of these units and discovered that the DAC part of the airplay functionality is a USB cable.
The cable had a bump in it which looked like a DAC cable so I took the cable and plugged it into my pc. Sure enough, it worked in my computer as a USB dac!
So I then took my AMB Gamma...