You may be able to source some directly from EMONA Instruments who made several ELVIS top boards...E2, E2+ and E3.
Check out their website for details...look for NI Application boards.
https://www.emona-tims.com/ni-elvis-add-on-boards/www.emona-tims.com
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Take a look at DATEx, FOTEx, HELEx & SIGEx add-in trainer boards for NI ELVIS 1,2 & 2+ and DXIQ, ESSB for NI ELVIS III and myDSP for myDAQ to learn Wireless Telecoms, Signals & Systems, Fiber Optics and Green Energy principles (www.emona-tims.com)
