Let's just say $779 CAD since that's the retail Canadian price and every province has different tax rates. For example it's only 5% in Alberta.
Canada isn't nearly as bad as other countries. Australia & UK is worse. Apple's prices are usually pretty dead on when comes to US/CAN pricing. Not so much for niche products like these though.
I assume it's because their main distribution centres are located in the US and Canada has higher import fees. For example we pay duties/taxes when importing something over $25. In the US they pay when it's over $800.