The Roon lads are ready to release an endpoint of their own. Roon Speakers, which will as rumours go be able to be installed on a Raspberry Pi 2. You could be looking at a very cheap alternative to Meridian's end points, just a Raspberry Pi with an IS2C Hifiberry into a DAC.

Naim NAC 202, Naim NAP 200, NAPSC, Chord 2Qute, B&W CM6 s2, Mac mini Roon Server, pi3 roon transport with allo digione.