Fiber optic cable itself isn't that expensive. You can easily get it for less than $0.20/foot.

It shouldn't be that much different in price to run fiber verse running cat6. The expensive part is the labor, not the cable.

I recently pulled OS2 fibre throughout my aparment and it was surprisingly inexpensive.

Four-fibre cable was about US$ 1.5/m (here in Switzerland, I am sure cheaper elsewhere).

I picked ONTi JT-S508CL-8S as the main 10G fibre switch (direct from Ali, for about 100 bucks).

For wired Ethernet and PoE, I have a couple of KeepLink KP-9000-9XHPML-X switches (I paid about 60 buck for each, they seem to cost around $85 now). I find that they work well and use them for 10/100/1000/2500 GbE switching and to power various devices (other switches, U7-Pro-XGS AP, Zigbee dongle, home automation server, rack fans etc).

The main splice box was about 60 bucks, 24 pigtails included.

From memory, 10G SFP+ fibre modules were about ten bucks apieces. (DAC cables are cheaper, 10G copper transceivers are more expensive.)

Plus various paraphenalia (wall face plates, keystone modules, more pigtails etc), all of which was pretty cheap.

Note that I was able to borrow a fusion splicer from a friend. Otherwise they seem to start at around 500 bucks; buying one would have been the single biggest expense.

I also run a 25G path from one point in my flat to my ISP. The cabling is exactly the same but 25G switching equipment and optics are considerably more expensive and less available than 10G.

You can check out FS (.com) it's quite cheap. For distribution from my attic (where all conduits converge to) to rooms I ran OS2 LC UPC duplex patch cables together with CAT6A. There I have a small rack with a patch panel and a PoE switch (to run APs) and from there I have a 48-strand trunk going to my basement where I have a bit of a larger rack with equipment. That way my APs are connected to main network via PoE switch which is connected via fiber and all the wall outlets with fibers are connected directly to main rack with equipment. Furthermore, I also ran another trunk from basement to garage where eventually I'll run everything from (with full height racks.. yeah, overkill) - with a wall patch panel I can just rewire trunk to trunk, close the panel and that's it.

If we're not accounting for switches, we're talking maybe few hundred euros at most including cables and outlets both for fiber and CAT6A, maybe 400-500 total or so where majority was CAT6A since I opted for the more _industrial one_, includes 150 I paid for help to run the cables through conduits. Fiber was all patch from distribution to walls, and trunk mainlines are _industrial_ fibers where in a single small diameter cable you have 48 strands of single mode. Actually in one I have 72 strands since guys didn't have 48 at the time and diameter is the same and price difference was small. This is for a three story house + basement and a run to the garage. I did the crimping myself, you do NOT "crimp" fiber yourself.. you get pre-made cables or for trunks you ask for pros with equipment to splice/fuse it for you.

Network equipment is a range of course. I opted for dream machine gateway for net and then the backbone is Switch pro XG Aggregation where most equipment is at with Switch Pro XG 10 PoE for APs (has dual 10GBit uplink), and a few smaller switches on the edges like Flex 2.5G for cameras etc. Yeah, I went full ubiquiti on that one and my mainline is basically 25Gb network, but it doesn't matter and that's the beauty of this setup - I could've easily gone full 1Gbit, 10, 25, 100, 400, even Nvidia/Mellanox 800Gbit OSFP with appropriate transcievers if one wants to go way overboard. Idea was to run this through to be future-proof cable-wise for another 10+ years (probably more), and for network setup to be for next 10 years (probably more) with 10/25G.