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One of the world’s top producers, Canada could cash in on the oat boom if it picks up the pace. Wallace Espresso’s weekly order of oat milk is starting to rival what it receives in cow’s milk. The small chain of coffee shops in downtown Toronto brings in as many as 21 cases — 252 litres — of oat milk per week. That’s far more than any other milk substitute and about half the company’s weekly supply of whole milk.