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You can apply a Google business search term to a context to give you multiple locations for that context. If you are limiting your shopping to only 3 markets, it should be easy enough to enter detailed search information to give you only those 3 markets. If you use generic search terms for the business search, the results often give results that are not helpful.

If you do an advanced search in the OmniFocus sub-forums for +Google +business +search you should find enough info to set up what you need.