I was wondering how such a topic warranted a total of 9 posts. I'm adding one more to see if it will get marked as a "hot topic".
We bought a 2nd power supply for both of our boxes and the extra power supplies did not come with a power cord. At $500 I guess it was too much of a deal to throw that in.
That is pretty common for Juniper products. When you order another power supply you always have to order a power cord, regardless of platform - switch, router, firewall, SA or MAG box.