Turns out that “HDMI 2.1” ports don't need to actually support HDMI 2.1 features | Ars Technica
Laser expands GTEK HDMI 2.1 cable range to 3m and 5m to support the latest products
8K Fiber Optic HDMI Cable (Support PS5 4K @120Hz)
Nixeus Ultra High Speed HDMI Certified Cable – Certified by HDMI to Support HDMI 2.1 Features, 48Gbps, Dynamic HDR, 4K 120Hz/144Hz, 5K 120Hz/144Hz, 8K 120Hz, and 10K 120Hz — nixeus
Amazon.com: huaham 8K Fiber Optic HDMI Cable 6.6ft, 48Gbps Ultra High Speed HDMI 2.1 Cable 8K@60Hz 4K@120Hz, Support eARC RTX 3090 HDCP 2.2&2.3 Dolby Compatible with PS5, Xbox Series X, Roku/Fire/Sony/LG CX
HDMI 2.1 low-down: Do you need a new cable? | TechHive
Best HDMI 2.1 Cables in India supporting up to 8k resolution - Smartprix
Amazon.co.jp: HDMI 2.1 Cable 3M Twozoh 8K HDMI Cable 48Gbps High Speed HDMI Male to Male 8k@60Hz 4k@120Hz UHD HDCP eARC 3D Ethernet for PS5,PS4,Fire TV, PC, Xbox : Electronics