Looking for a reasonably priced 20A power cord


I've decided to purchased a Niagara 5000 unit to power my system and I need a power cord for it, it doesn't come with one. The unit will be 20 inches from the wall socket so I don't need a long power cord. I'm looking for a reasonable 20A power cord, something of good quality. 

Any suggestions? 
 
larrykell
BTW, I would recommend you avoid making your power cable too precise.  There will always be times when you want to move things around, so the shortest I'd recommend is 3'
Best,
E
Thanks for the information, Erik. I’m looking for an off the shelf solution.

I live in a small apartment, the rack is not going to move, it will stay 20 inches from the wall which had two dedicated 20A circuits, and the Niagara 5000 will be put standing up on its side against the rack. So, I don’t need a long power cord.