Hi, We will be flying from the U.S. to Calgary at the end of August and going to Lake Louise, then Jasper, and ending up in Banff. I understand that Lake Louise has a small grocery store and no banks, just an ATM. We will be staying in cabins and want to get just a few items to make breakfast and lunch. Is it that much cheaper to hit one of the grocery stores in Canmore or Banff on our way or just go to the Lake Louise market? Also, should I get cash at home and then exchange it at a bank in Canmore/Banff or just get Canadian money from an ATM at the airport?