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Yes! Turf Wars and Ruins of the Empire are the two Korra comics and they are both good. You can buy them all on Amazon (here is Turf Wars: https://www.amazon.com/Legend-Korra-Turf-Wars-Library/dp/1506702023). Sorry I am not sure about shipping to Canada. Also check the About tab for this subreddit for other links to buy the comics!
You were right on the mark! Korrasami is canon! They started to like each other over the course of books 3 and 4 and walked into the portal to get away from the city for a few weeks. While they were in the spirit world they kinda fell in love and returned to the city as a couple. You can read all about their vacation in the turf wars comic books that take place after the events of the show. I technically shouldn't do this but here ya go
I would really recommend buying the library edition of the comics though!
Also check out r/korrasami
The comics can be bought from comic stores, book stores, Amazon, and digital comic apps like comixology.
Turf Wars Library Edition
Here you go!
I found the turf wars library edition on Amazon (Amazon link)
But you can buy them all digitally here.
You can also buy them at your local Books a Million/Barnes and Nobles but I cannot guarantee they will have the full sets.
I honestly have no idea. I would just get the library version off amazon that has all 3 volumes.