Amazon has GearIT-brand Ultra High Speed HDMI cables, 10 feet, for $3.99, free shipping with Prime.
Ultra High Speed HDMI cables are required for HDMI 2.1.
I don’t have any first-hand experience with the GearIT brand, but it looks bit more professional than the typical off-hand brands found on Amazon.
https://www.amazon.com/dp/B07MSHNDQ3
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