RME MADIface USB 2.0 Audio Interface with 2 x MADI I/O (Optical and Coax), and TotalMix FX Management Software : Amazon.co.uk: Musical Instruments & DJ
Allen & Heath SQ Madi Audio Interface Expansion Card for SQ | Bax Music
RME MADIface XT 394-Channel Triple MADI USB 3.0 Audio Interface – Pixel Pro Audio