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In Ottawa the cheapest basket and the priciest basket belong to the same company: $115.98 at Real Canadian Superstore, $142.76 at Your Independent Grocer, both Loblaw. Same 21 brands, same pack sizes, no substitutions.
Every Thursday I price that list at every grocery chain within 15 km of downtown in a few Canadian cities. Seven cities this week - the full tables are in the images. Toronto does the same thing, $33 apart.
Which banner you walk into is doing more work than which company you're buying from. The other surprise is that the gap inside one city is bigger than the gap between cities.
Prices come from the stores' own websites and flyers, read today, sale or regular, whichever is lower. Where a store didn't list an item, it's charged the highest price anyone in that city listed for it, so a gap never makes a store look cheap - each image says how many of the 21 that store actually listed. In-store prices can differ from listed ones.
Want a city or an item added? See my comment below.