Melissa J.
Yelp
Although I am not Japanese (or any kind of Asian for that matter), I wish I was because of all the cute things that exist in Japan. Plus they have a really cool language, and it's a good culture to belong to if you're a germaphobe like me.
So when I'm feeling like I REALLY REALLY want to go to Japan, I go to Sanko instead and it's like I'm there. They import all sorts of Japanese grocery products as well as cookies, candies, magazines, kitchen supplies, and everything else.
In the realm of downtown Toronto, this is probably one of your best bets for this kind of stuff, and because they have little competition, their prices aren't the cheapest. But I am from the north, and up in Scarborough we have many other options for these types of products -- usually in the Kennedy & Steeles area. They have all sorts of places with this stuff in Pacific Mall, and especially if you're just looking for trinkets or food basics like Pocky or seaweed, they'll have them for way cheaper. Plus, Japanese magazines are totally cheaper in Chinatown.
But hey, if you're on Queen West, and you're craving some individually packaged seaweed, Sanko's the place to get it. And if you're willing to pay a dollar more for convenience, then you'll be fine with it too.
Note to anyone with strollers/wheelchairs/anything: The place is SO SMALL and really narrow. Don't try bringing even a backpack in here. There is literally no room, just like the subway in Japan.