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This largely depends on how classy you are, and what materials you need to go through.

The cheapest and least-classy option, is just a long cable.

The step-up is something like Powerline, where you use an adaptor that uses the power lines in your house. Still no contractor needed.

The next step is to actually wire through walls/ceilings, or to run a bunch of conduits.

If you go the powerline route, you are looking as cheap as $50-$100.
If you do the contractor route, well, it could be thousands if you run into a bunch of problems. It might only be a couple hundred though.

A known issue with Lemmy, is that sometimes the sub-count only shows the number of people from your instance that are subscribed to the community, as opposed the actual number of people subscribed.

I only see 4 subscribers, when I go to https://selfhosted.forum/c/homenetworking I see 91.

Also, I am not subscribed here. I just sort by new.