Where can I find a credible and comprehensive list of major grocery
stores found in major US and Canadian Centres (with populations at
about one million or over). ($20)

Where can I find regularly updated sales flyers for these major stores
online other than their proprietary web sites. ($30)

Ms. Marketing

You will probably do better if you repost each of these questions
separately. When you bundle two research projects together, a
Researcher must successfully answer both parts in order to be paid. If
each question were posted separately, you would be more likely to get
good responses.