They really aren't that available in Canada. The vast majority of them made it into the States and stayed there. Looking online you can find a fantastic site set up by a Canadian collector of Japanese Nambus, and some of her numbers are interesting (
http://members.shaw.ca/tju/jhg.htm). "November, 2006 (the latest available) finds that there are 178 Type 14s, 50 Type 94s, 27 Type 26s, 5 Papas, 4 Babys and one Grandpa ... the individual records on each of these and attributing them to their most likely type leads to these revised figures: 193 Type 14s (30 of them mine), 50 Type 94s (8 of them mine), 30 Type 26s (5 of them mine), 5 Papas (3 of them mine), 4 Babys (2 of them mine), one Grandpa (not mine—yet!) and one post-war New Nambu M57A (not mine), a total of 284 specimens".
Basically as of 2006 she figures there is a total of 193 Type 14 Nambus in Canada (and I can't see the number increasing that much since then). So realistically your looking at less than 200 pistols in Canada, likely all in the hands of people who enjoy keeping them. I can't ever recall seeing a Type 14 Nambu for sale in country, however I have seen one or two Type 26 revolvers for sale (likely just less interesting to most people or the fact the ammo is non-existant). Your best bet is honestly to try and import one if it is what you really desire. Hope this helps.