Didn't it come with one?
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In contrast to the prior posters, if your budget allows, you might try something in the middle of the Shunyata line. I had a 640C v.1 for several years and found that it worked great with an older Python Vx and a Black Mamba. Those cords or something comparable in their more recent lines can be had for around $350 here on Agon.
What's nice about that approach is that you'll have a power cord that you can keep around longterm and reuse if (when?) you upgrade your digital front end.