Newfie here! I usually stock up when I go home but I know I've seen it for sale up here.
I believe I saw it at Giant Tiger (corner of Elbow & Southland Dr SW). I know they carry a few Purity products, which struck me as strange. I live close to there... I'll check this weekend when I visit the Planet Organic next door and edit this response to confirm.
Have you tried any Sobey's stores? I've found Purity cookies, candy & syrup there before. Also, one of my friends on Facebook just posted that he found salt beef at Co-op on Blackfoot so those are some "maybe" stores for savoury.