Where can I buy them in Europe, without ordering online?

Additionally, how many posts from online forums do you want with counter-examples from them?

If you are in europe you have plenty of choice: slimbook, tuxedo, starlabs, novacustom, keynux, skikk....I think framework ships to europe and make sure their laptops are compatible with linux too:

https://frame.work/es/en/linux

EDIT: I hadn't seen the "without ordering online"

You just check what models/chipsets are supported when you are in the shops