France: "Auto-entrepreneur" status is free. No conditions (and a limitation on how much money you make). "entreprise individuelle" is between 25,34 € and 130 €. SARL and SAS status is ~200 € [0].

For all of them, you can do it yourself and most of them completely online.

[0]: https://www.service-public.fr/professionnels-entreprises/vos...