I'd suggest westcoastshaving.com if they had any in first of all, but they're out.
shoeboxshaveshop.com would be next, but no go to Canada.
Other than that post a WTB in the BST forum and see if someone has a new one they could sell you, or used if you're good with that. Good luck in getting one soon!
I bought mine from WCS along with a $10 blade sampler and shipping was something like $4 to Canada. Maybe you should just wait till they get them back in stock. Cheapest place too, $22.
I have a 31064 and and a 31156 that I use in my rotation. If you can't get a 31064 try the 31156 that is available at shoeboxshaveshop. Both are great looking and performing. The 31156 has a dark Green/black veined handle and the same boar knot. Performance is the same. Doug Rosso