018 is an awesome one, oh wait I own it - heh, heh
Don't see much demand for nnn.ca right now, but they are all taken, so any demand will start to push up asking prices. I have a few but I only bought them because they were all getting regged. Kind of a buy first and think about it later situation. There are ony 1,000 possible combinations, demand for nnn.com is high, so .ca will follow eventually.
I remember checking and seeing hundreds of nnn.ca available less than two years ago, and I don't feel any remorse about not regging more (yet). Also think there is more use for letters than numbers in .ca domains, generally speaking. Not many popular .ca sites that have only numbers in the domain.
Like was posted earlier, NNN.ca are a 'hold' right now, don't drop any if you have them.