I think http://www.flyerland.ca is good and has links to main grocery store chains as well as any other shopping you would like to do.
This link will bring you to Ottawa grocery flyers specifically: http://ottawa.flyerland.ca/flyers/category/grocery/12
Loblaws: Ogilvie Location Weekly Flyer
Metro: Ontario Flyers
Food Basics: Weekly Flyer
No Frills: Orleans Weekly Flyer
Ottawa Neighborhood Food Business
Ottawa Byward Market:
La Bottega Italian Gourmet Deli Food – great selection of cheeses and everything else Italian you can think of.
Planet Coffee café – artist’s hangout with great coffee, paninis and desserts. Try their peanut butter chocolate squares or their cream cheese brownies.
Piccolo Grande gelato – tons of yummy flavours
The Cupcake Lounge – Cupcakes in the heart of the Byward Market
Domus Housewares and Café – I haven’t eaten there but I hear it’s good. The housewares shop next door is amazing.
Oh So Good – Desserts, coffee, hot chocolate. Good date spot. Urbanspoon.com review.
The Flour Shoppe – Cupcakery with a great location near a park and few minutes walk from the Rideau Canal Patterson Creek.
Truffle Treasures – handmade chocolates, gelato
The Glebe Emporium – kitchen accessories galore. Links to article in ottawaplus.ca
Truffle Treasures, Westboro location
Ottawa Bagelshop and Deli – bagels and gourmet goods
The Works – crazy burger joint
Isobel’s cupcakes – nut-free
Thimblecakes cupcakes – nut-free, organic. Mini’s available.
The Cupcake Fairy – orders only, two weeks in advance.
Little Cakes – orders only.