Please suggest a really cheap SPDIF coaxial BNC cable for testing if my DAC is working

I am in the process of finding out whether my Transport is not sending signal or DAC is not receiving because my DAC displays "No Data" error. Changed ll cables, inputs, no change. I now found an old Wadia 1000 DAC which uses only SPDIF coaxial BNC cables. When I searched on Amazon, while I found BNC cables, they were not SPDIF. I do not want to get the wrong ones. Can someone help me find really cheap SPDIF cables with BNC termination Male-Male? These are only for testing and if the equipment works, I will get better cables but for now, I want to get some $20 or so cables, if possible.  I would appreciate if you can give me a link to the right ones. Thanks

Arun