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.
Muv's marmalade tutorial - special for Paddington fans
Tell me about oranges please...
Also look at this:-
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!