The book is in stock at several Indigo locations, including the following three big ones in Toronto.
I have also heard that people are already getting shipping confirmations from Amazon.
If you have a local bookstore you want to support, they might have it already too, so give them a call! If not, they can probably get it in very quickly now.
Or you can always order directly from Invisible and support the publisher directly.
And don't forget about everyone's good pals at Kobo!