Yeah, I checked out the local Superstore, No Frills, Walmart, Sobeys etc. and no go. I suspect I'll have to find an oriental market.Any oriental market will have it. I don't know what you have in the west end, you might have to go downtown. I shop a lot at Sun Wah on King St. Note that mirin is salted so keep that in mind for your seasoning.
Edit: My Superstore on Bison Dr has it in their international foods aisle, but there is a large oriental population in that area. Don't know if yours would have it.
m.