This is a low jitter USB receiver board built by Empirical Audio that uses the CEntrance code, providing I2S out. I'll include a carrier board that gives you the necessary connections for power and I2S. Very good sounding! $150 new for parts alone and you can't get the software. Here's your chance for both for $100 with shipping in the US.
Yes, I'll provided documentation and hold your hand with questions.
Call 513 697 1187 if you like.