If you have watched my Youtube video showing how to make marmalade and want to have a go, make sure you use Seville oranges. Please read these two threads, and all the links, for information about oranges.
http://www.quiltingboard.com/recipes...s-t174228.html
http://www.quiltingboard.com/recipes...e-t174337.html
Also look at this:-
http://en.wikipedia.org/wiki/Bitter_orange
From what I gather, you are more likely to be able to get Seville oranges in Canada than in the USA.
Don't let this stop you watching the video, because the next recipe I intend to put on Youtube will be a red grapefruit marmalade - the method is very similar, and you will have no trouble getting hold of the right fruit!