Not only that, but they only rolled out the Comixology web store in the US and UK:

https://www.amazon.com/kindle-dbs/comics-store/home

There is no such page on Amazon.ca, Amazon.com.au, etc. Actually, the route exists, but it's broken:

https://www.amazon.ca/kindle-dbs/comics-store/home

In Canada, the only place I can buy Comixology titles now is the generic Kindle store, and it's pretty bad for browsing comics.