its hard to get good, cheap mexican food anywhere in canada. as soon as i get across the border, its the first thing im after... slowly more mexican-type food is becoming available in vancouver and toronto, but usually they are either fancy, sit-down, expensive restaurants, or else generic burrito wrap places.
dont know if sushi counts as fast food for most of you, but in vancouver sushi bang is my favourite fast food. eighteen pieces plus miso for $6