Well if I had the best amplifier in the world, and matched it with the finest speakers in the world, I would probably just use lamp cord too.
This is the power cable I use. I'm not affiliated with the manufacturer/seller/online-platform. Try it yourself it'll certainly please your eyes and perform like $1000 cables.
"WAudio 3.3FT AC Power Cable 10AWG HiFi Audiophile Power Cord with US Plug IEC Connector"