Here is a list of catteries around the world where you can find at least a couple of Siberians belonging to groups 1, 2, or 3. This list will be made by country. Please note that even if there are good couples in these catteries, the genealogy must be checked anyway, considering some among these, unfortunately, do have cats in group 4.
France
Spain
Norway
Italy
Poland
Siber Felis
Finland
Friendly cattery in Bulgary
Sibirella
Colombia
England
Sweden
China
USA
Rockaran Siberians