I don't know offhand, but a couple of places that carry a lot of Japanese groceries are:
Epicerie Coréene et Japonais - 6151 Sherbrooke West, corner Beaconsfield 514-487-1672
Miyamoto - 382 Victoria, south of Sherbrooke 514-481-1952
New Ja Mae - 2116, boulevard Décarie 514-489-9777
There's also another Japanese grocery on Ste-Catherine near Atwater.
You might try calling.... Good luck!