No premium HDMI in my size

andsaw

I want a 3.5m Premium Certified 18Gbps HDMI Cable but cant find any, only 3m or 5m, am i stuck with just these sizes.

Atavus

https://www.amazon.co.uk/SlimHDMI-Premium-Certified-Secure-Connector-4K-Locking-Cable/dp/B07FQSPPC7

EndlessWaves

Just get one that hasn't been through the certification program then. It's only an independent verification program. If a £2.50, 150g cable doesn't live up to the manufacturer's claims you can easily return it or throw it away.