nostr:npub1995y964wmxl94crx3ksfley24szjr390skdd237ex9z7ttp5c9lqld8vtf runs a relay, too.

That relay is running on a used thin-client PC sitting behind my home office desk.

It depends on what you want to do, but in general you can start with cheap hardware and then try if it's working for you.

To run a relay, I prefer to install Docker and then run for example nostr-rs-relay software with Docker.

If you need more information or help, feel free to contact me or nostr:npub1995y964wmxl94crx3ksfley24szjr390skdd237ex9z7ttp5c9lqld8vtf :)