Ship's Shops on an Eastern Canadian cruise

We will be on the Quest for a New England/Eastern Canada cruise in September. Since I believe the St. Lawrence Seaway does not constitute international waters, I was wondering if anyone knows if the shops will be open at all once we enter the Seaway until the end of the cruise in Montreal. Not that I am a big shopper, but I often have a shipboard credit to spend.

...and what about the casino too?

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I am even less of a gambler than a shopper so I wasn't worried about the casino!

I did this cruise on Crystal and surprisingly the casino and the shops were open when we were in the St. Lawrence. I was surprised, but happy.