I think sometimes the earliest deals may be used to address currency fluctuations in Canada. If the price moves enough it can be cheaper to just buy and import from the US, which isn't great for Canadian retailers. Obviously that works both ways: speaking from memory, I remember reading a rumor here about incoming increases to lens prices in Canada and snapped up a 70-200 before it hit. That rumour was right, and saved me a noticable amount of money!
Right now all things considered it looks to be a bit cheaper to buy an R5 in the US and import rather than buying here, so I could see some deals to address the issue if the CAD continues to get closer to the USD.