When Microsoft announced the Surface Book 2, the bigger 15-inch model was announced to be exclusively available in the USA. A few months later, Microsofts expands the availability to many more markets including Canada, Australia, New Zealand, Ireland and the United Kingdom.
https://www.notebookcheck.net/Microsoft-Surface-Book-2-Bigger-15-inch-model-is-now-available-in-more-markets.278800.0.html