Thank you all very much for your helpful suggestions. I'll be eating mostly seafood in the Maritimes, but a good rib eye or hangar steak is a nice change of pace. When last I traveled extensively in Canada (2008), I was able to get some excellent beef in Calgary at a place called "Bon Ton". Getaway Farms sounds like the right place, and the Seaport Market should have lots of other things (sweet corn, tomatoes, etc.) as well. This should be a great trip...the people, the hospitality, the scenery and...of course...the wonderful music.
I will be traveling to Atlantic Canada in June, July and August of this year. I'd like to find some butchers that carry prime beef in New Brunswick, Nova Scotia, Newfoundland and Labrador. Any suggestions?