I'm hoping someone can answer your question as I'm curious, too. I've been buying them from a U.S. site Sierra Trading Post for the past few years. They ship very quickly and the prices are reasonable and the selection isn't too bad, either. Prior to that I was lucky and found them on the Canadian Sears site, not recently, though. I always take a pair or two for our Disney trips - I can walk for hours in them!
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