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New Raspberry Pi 5 comes with PCIe 2.0 x1 interface and power button
(www.raspberrypi.com)
This is a most excellent place for technology news and articles.
It's not free, but it's not really that hard either. You can even get fancy and use isolated power for some extra safety.
I'd like to see some more specialized versions of these boards. For instance one that trades the MIPI ports (which I have literally never found a use for) for PoE or some other feature that's more useful in a networking centric use case. In many cases I'd even be willing to give up a USB port for that.
Yeah well, that's like the whole area for the USB and Ethernet plugs taken up. You also definitely want an isolated one for a device that's supposed to be used by end users.