National Film Board of Canada's free online archive. This is an absolute treasure trove of material, some of which will take you back to your childhood when gaps between programmes were filled, not with a tenor singing about car insurance, but with short films from around the world (where "the world" is Canada and Poland).
You can also pay to download many of these films, which I strongly urge you to do.
To get you started, here's The Big Snit.
Also, three recommendations from pal Jonathan (@jonzo1), an actual Canadian: The Log Driver's Waltz (which played on the telly every day when he was a kid), The Sweater (warning: contains comedy accent), and The Cat Came Back (which was nominated for an Oscar, and will certainly end up on the home page of Eoghan's My Cat is an Asshole blog, if he ever makes good on his threat to set that up.)