cruzaderNOB
For my own lab, ebay.
As a small company reselling hardware, ebay + directly from ebay sellers off ebay.
Whoever sells asrockrack in your area?..
It stops being homelab when the focus goes from labbing to production, when it becomes a homeprod enviroment instead.
You would need to have the nvme not sas/sata SFF cage for this to work.
Otherwise what you are looking for is an adapter going to pci-e slot.
Strange setup for AI with the specs/chips usualy in the nucs/minis.
But unless you plan to strip the pcbs out of the case etc type stuff they will not be happy running very dense.
If you got a healthy budget id expect you to look towards the stuff made for rack and the usecase.
Tailscale and a cheap VPS running the exit node tends to be a common route.
Lets you expose services out without opening anything localy and gets you full control out from the VPS without ISP meddeling.
There are other alternatives but tailscale has the best free tier with upto 100 devices, exit node+router, solid access control and mfa.
Anything rack related or switches above lower end consumer is rarely on the sales.
If doing a consumer/whitebox build you might find some stuff tho.
Spinners for capacity storage tend to have good deals also.
I hope you got it for free and did not pay for that thing.
But as for usecase you might want to add what gen box it is and what controller/expander it has installed in the rear.
atm im not running much since not much time to lab, just the base stack.
about 35€/mo for 650w average consumption.