I don’t have one myself, so I can’t really recommend a specific model from experience. There are many available, but I’ve e.g. seen beelink mentioned a few times. Maybe someone else here is running one and can give some recommendations?

If you are facing availability issues I’d to the reverse and rather then asking for recommendations look at what’s available and then do a quick search or ask about it (e.g. if someone has already used it with whatever Linux distro you plan on using). Should you have access to something like AliExpress then there are plenty of options.

Maybe a mini PC with a N100 might be worth a look? Especially when factoring in running costs over it’s lifetime

You and all the companies training their AI models, like Meta for example