We're an ISP, but we do other things, including Firewall/routers, but also simple things like printed plastic cards, and, as some may be surprised, small PCBs for all sorts.
https://www.aa.net.uk/etc/circuit-boards/
One product we have tried is a controller for Daikin air-con, and it seems to be taking off. So I have 100 more on order, which should be available in a couple of weeks on Amazon.
https://www.amazon.co.uk/dp/B0C2ZYXNYQ
This is open source hardware and software so you can make your own too.
^RevK