Actually, expansive items are cheaper in the US, than they are here. Even with a favorable rate. Wine, cars, cigars, for some examples.
A 16$ wine bottle here can be bought for around 9 USD (12 CAD) in Florida (that is a cheap bottle, but the one I regularly buy, so I have a more precise memory) and it gets even more pronounced with higher priced items. That is unless it changed in the last two months.
That is obviously also greatly influenced by state taxes on those kind of products. The US have a bigger buying power, which often translates in more competitive price. Also, original pricing are set in USD for most international compagnies and they apply a ''safety" rate for other countries.
Another example:
Apple iPad Pro = 649 USD and 869 CAD on their respective websites.
Today's rate is app. 1.27, so 649 USD x 1.27 = 824 CAD
6-8% sale tax in Florida vs 15% here.
Final: 882$ CAD (bought in FL) vs 999 CAD (bought in QC).
The bigger the price tag, often the biggest that gap grows. Let's not forget that millionaires don't buy the same stuff as most folks. I like my 16$ bottle of wine, even though I sometime spend 100$ on another one (well, rarely). Those guys can spend that 100$ way more often than I, without even feeling it. On those bottles, the savings can sometime be around 20% vs their Canadian counterparts.
Real estate, well that is another story and quite more complex.