Photography, Digital Camera, Lens Price Comparisons for Canada - photoprice.ca is still your best bet for Canadian prices.
Check out the big 3 in the states (B&H, Amazon, Adorama)- when you go to checkout, you will see the prices including brokerage fees and taxes, so you'll know exactly how much you'll be paying to get it shipped to your door. If you have time, get it shipped to PR. There's the off chance you won't get taxed when you declare it and you can save a bundle.
Buying Canon in the states is fine, because Canon Canada will warranty US cameras. Just don't get the Grey Market ones from Adorama.