Best place for affordable and good quality sushi basics in the Plateau. The store has lots of Asian ingredients and snacks (Gluten-free Panko, Glico Japanese curry cubes, etc.). They are a little pricier, but given there are no other Asian markets nearby it is not unreasonable.
As with any affordable sushi place, stick with the basics (avocado, california rolls, salmon). Their avocado rolls and salmon avocado rolls are one of the best. Be smart and order at the counter so you get fresh sushi: refrigerated sushi isn't the best anywhere you go. Not to mention, any affordable sushi restaurant won't have the best tuna because Montreal is not a coastal city.