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 what power cords are on your Dac and Transport?
While we are at it (if you don't mind) which Dac and Transport are you using?
I have stock power cords on the DAC and transport, but I’m plugging them into the Isotek power conditioner with the Elite power cord. 
Components are the Schiit Gungnir Multibit DAC and the Cambridge CXC  transport (or sometimes the Oppo 105D used as transport which has good synergy with the Gungnir.)
I am surprised not to see Ice Age power cords mentioned here. They are well made and relatively inexpensive. They are cryo treated and come in various configurations carbon/ copper, copper/copper, silver/copper, etc. I have the copper/silvers on my Martin Logan Vistas and the copper/copper on my Marantz SACD player. A significant improvement all around, but the copper/copper on the Marantz was really surprising: better bass, a more dimensional sound and a deeper sound stage. Highly recommended for less than $150.