Need recommendations for inexpensive power cord


I’ve never used after market power cords and am considering buying a couple.  I have some questions:

Considering the astronomical price power cords go for, is there any point getting one or two in a lower price range?
At what price point do power cords start to make a difference in your system?
I have two monoblock NuForce class D 160 watt amps.  Is this where they should go? 
Can someone recommend an inexpensive power cord that can make a difference?

 
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The Gungnir is definitely superior to the Oppo by itself.  But I found if I used the Oppo as a transport in conjunction with the Gumby it produced better results than with my Cambridge transport. Strange.  I’m still experimenting though.
I can highly recommend the Gungnir.
In my experience Power Cord upgrading was far more effective upgrade than a power conditioner (a PS Audio  Dectet) which I returned to the retailer. I have since made my own power cords. Not difficult, not expensive and big improvement to SQ.
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