While at Costco on the weekend, I was surprised to find Dunn's Montreal smoked meat! They're selling them in the refrigerated section, and also in their hot food stand in a bun plus a pickle (after the check out).
Each box comes with six pouches of pre-sliced meat. I picked one up to try and while it doesn't taste as good as getting it in a restaurant, it does taste better than getting it as luncheon meat from the grocery store deli.
Not sure if they're selling them at all the Costco stores; the one I found them at was in the west end.