Solid core power cords under 300$ - List of manufacturers ?

Check out Essential sound products. He has supplied recording studios and musicians with power cords. The power cords start at $200 to $2000. 

Jea48:

Good point about the screw terminals. I would go a bit further to say that what you say goes for ALL terminations regardless of cable used. 

I remember having that exact experience with the female PC connectors. I don't remember the brands, but I seem to remember one was a well known brand that didn't seem to work too well. 

I would also be leery of using depending on solder to make up for a connection, that is, if you can't get a tight connection with the screw terminal, should pay extra close attention to how you solder it to ensure it doesn't fail for the same reasons. 

auxinput

... low grade copper will not be able to charge/discharge the higher frequencies and you’ll have high frequency roll off.

Could you please explain these "high frequencies?" Isn’t a power cord set at 60 hZ in the US, by definition?

In addition, PVC insulation will act as a restriction (i.e. dielectric resistance) that robs current.

How can insulation "rob current?" If the PC is measures low resistance - which would be factored into its amperage rating - wouldn’t that be sufficient?