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?

 
128x128rvpiano
@rvpiano , Hi side question . I have a Schiit Bifrost Uber and a Musical Fidelity transport . And also an older Oppo . I’m cost driven . Are you satisfied with the Gumby ? I listen to Tidal and a few CD’s . Second , with what I have now , Gumby or Oppo first ? BTW , I run the Silnote cords ($99) . Just ordered the entry level digital cord from Signal . Saw it mentioned quit a bit in this thread . If I can tell a difference , I’ll get the upgrade one. Thanks for any advise .  Mike B , Clovis, Ca.
@rvpiano, good move on the Isotek power conditioner with the Elite power cord. All I'm suggesting is that if you should ever want to upgrade the power cord or cords to your Dac, Transport or Oppo I believe you will hear an additional improvement in your music.
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.