@Svein Erik: My source for Mara 220 is http://www.tokokurzwaren.de/ The shop is in german language only. But they are also selling worldwide through amazon.com, yet not all available colors and sizes are advertised on amazon. It may be worth a try to mail them and ask about delivery to your country.
Other Mara sizes are more widely available online. In the UK, William Gee carries many of them, with all colors available through their website: https://www.williamgee.co.uk/shop/gutermann-threads-mara-150/
Klaus