If you have a meeting in the downtown Ottawa area there are sandwiches for about 2 bucks at The German-Town Deli (aka “The German Deli”).
It’s on Slater at Bank Street.
For less than 5 bucks you can pick up breakfast and lunch when passing by in the morning. I eat a sandwich while walking, then put the other in my pocket, then to a fridge if there’s one around when I get to my meeting or delivery.
Saves lugging your lunch around and you can do meetings in the core without blowing a huge load of money on food.