Looking for a reasonably priced 20A power cord

Check THE CABLE CO. you may be able to demo a couple of power cords.

I don't know what "reasonably priced" means.  But here are a couple options I see:

https://www.usedcable.com/power-cables/voodoo-cable-black-magic-20-amp-iec-5ft-1-5m-power-cables.html


And Audio Sensibility makes several cables that have an option for 20A IEC.  They are in Canada and pricing is CAD.  USD is about 75% of CAD right now.  The minimum IEC they offer is the Statement SE, which is 384 CAD or $283 USD.  The Statement model is likely better because it's larger at 11awg, but much more expensive.

https://audiosensibility.com/blog/products-2/power-cables-2/

Power cords with 20A IEC can be hard to find because many companies only offer this as an option.  Not sure if "The Cable Company" would have many or any to test because this is not really the norm.

There's Cullen Cable: http://www.cullencable.com/crossover-series/
He makes several lines of cables and this one is kind of in the middle of his offerings.

All the best,
Nonoise

Audioquest Thunder 

Sorry, I need to make corrections to my post.  For Audio Sensibility, the minimum 20A IEC power cord option is the Testament SE (not Statement).

That Voodoo Black Magic might be a good option because it's a huge 8awg cord which will carry a lot of current.  However, it's described as "micro-fine copper conductors", which tells me it uses very tiny strands of wire (not good in my opinion).  The Audio Sensibility cords all use OCC copper, which is better.

The nonoise suggestion of Cullen could be a good for the money option, but keep in mind that they use silver-plated copper and is only 4N copper (not a lot).

I just thought of another option here:

https://www.vhaudio.com/powercables.html

I suspect the VH Audio cables are likely the best of all the options we have discussed.  The "VH Audio flavor 4" cables appear to be what you want.  It's a large 9awg cord.  It uses "low strand count" bundles, which tell me the individual wire strands are rather thick (good thing).  I priced a 4 foot with Furutech Gold 15A male and a Furutech Gold 20A IEC for $408.  It might be more than what you want to spend, but I think it's the best option in this "reasonable" area (before pricing really gets crazy)