I used to love this stuff as a kid. After searching high and low and hearing rumors of it being discontinued I got desperate and decided to try fleabay on a whim. Somehow there seemed to be Banana Nesquick in abundance there. Problem is that it's all in the UK. I guess they still produce it there.
I just did a check and there only seems to be
one seller at the moment with 3 left in stock. It's ~$20 shipped to the US for 500g. Pretty steep, but then again, that's a lot better price than it no longer existing. Send him/her a message and see what the shipping cost is to Canada.
On a side note, I wish I could still get Hi-C Ecto Cooler too. That stuff was the bomb.