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

The reason there is an aftermarket of power cords is precisely because solid core wire is illegal for use in a power cord. Romex is extremely high performance, which is why you really don't have to worry about what's in the walls (if that is what you have), and why that last 6' of power cord can make a difference (because it has to be multi-stranded).

But the liability of making a power cord out of romex is profound, so no-one actually does it.

So, in short (pun intended) there is no such thing as a power cord made of solid core wire.

Then how come Audioquest describes their new super power cords’ conductors as “solid.” For example, the Hurricane high current power cord, much reviewed recently by Fremer at Stereophile and by several right here on Audiogon, is described as follows on the Audioquest web page. Is the Audioquest dude going to jail?

Solid Perfect-Surface Copper+ (PSC+) Conductors
Uncompressed High-Current Transfer
Ground Noise Dissipation Technology (US Patent # 9,373,439)
Zero Characteristic Impedance (50Hz – 1MHz)
72VDC Dielectric Bias System (US Patent #7,126,055)
Directionally Controlled Conductors

The Dragon high current power cord:

Solid Perfect-Surface Silver (PSS)/Perfect-Surface Copper+ (PSC+) Conductors
Uncompressed High-Current Transfer
Ground Noise Dissipation Technology (US Patent # 9,373,439)
Zero Characteristic Impedance (50Hz – 1MHz)
Dielectric-Bias System with Radio Frequency Noise Trap
Directionally Controlled Conductors

When was the last time anyone has read a thread where someone said their solid core wire power cord failed? There is a ton of them out there. Anybody ever heard of a failure? I guess if a person deliberately tried to make a connection fail they could cause it to fail. Of course the same would be true even with stranded wire conductors if abused to the point of failure. How often do you guys over bend back and forth you power cables at the connector ends?

It’s a power cord. It’s not a drop cord. It is not designed to be used as a drop cord.

Solid wire power cord.
Lets keep it simple. Here is a Link to an older AudioQuest AC12 power cord. Just going from memory it was first introduced in the early 1990s.
https://www.google.com/search?q=audioquest+ac-12+power+cord&tbm=isch&source=iu&ictx=1&am...:
Note the 8 solid copper #18 gauge insulated conductors. 4 white conductors and 4 black conductors. The equipment ground is the green #12 stranded copper wire located in the center of the 8 insulated #18 solid copper wires.

The 4 white insulated #18 solid wires are wired in parallel making it the neutral conductor. The equivalent wire gauge is #12awg.

The 4 black insulated #18 solid wires are wired in parallel making it the Hot conductor. The equivalent wire gauge is #12awg.

Combined wire gauge calculator.
https://www.wirebarn.com/Combined-Wire-Gauge-Calculator_ep_42.html


As for some law that says a power cord must be safety tested and Listed, I don’t know of one. In fact I don’t of any law that says audio equipment must be Listed.

Listed = NRTL , UL is just one example.
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Listed = NRTL , UL is just one example.

While there are other testing laboratories, they're going to test the product  for compliance with UL Standards, as compliance with UL safety standards is what allows you to buy product liability insurance.

That pesky liability! Say'n!