Going through my stuff and I found these two miniDSP expansion boards. See pics below. I don't believe they are made anymore, so hopefully they can help a fellow member. $30 each shipped in the USA. Please contact me for international shipping quotes.
miniDSP Vol-FP expansion board (blue board with volume pot and LEDs). $30 shipped in the USA
miniDSP miniSHARC I/O card v1.0 (green board). $30 shipped in the USA
miniDSP Vol-FP expansion board (blue board with volume pot and LEDs). $30 shipped in the USA
miniDSP miniSHARC I/O card v1.0 (green board). $30 shipped in the USA