In the US at least, you can get the full series through Amazon Prime, if you get the PBS add-on subscription. Also includes things like Mr. Rogers and Kratts' Creatures.
My best guess is "no one bothered to sell the Canadian streaming rights to any of the big players like D+/Netflix/Crave".
Here in Toronto it looks to me as though you should be able to stream Season 4 for free via the Toronto Public Libraries' Kanopy subscription, though I have no idea why just S4.
I realize this isn't what you were looking for per se but just in case you didn't know and it's of interest, it seems to be available (for purchase) via AppleTV.
It looks to me as though they might have all seasons from 1-21 there, mostly at a price of $2/episode or $15/season.
Yeah, I saw you could buy it for $2/episode. $15/season might be better. I have a hard time paying to "buy" electronic media when we are paying several services monthly for access though!
You'll have to sign up for a (free) Kanopy Account and then connect it to your TPL library account info to it, and then it looks like there's only the (10) episodes from Season 4 there (why, I have no idea) but...
... as far as I can tell all 10 episodes from Season 4 eps are full episodes.
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Here in Toronto it looks to me as though you should be able to stream Season 4 for free via the Toronto Public Libraries' Kanopy subscription, though I have no idea why just S4.
It looks to me as though they might have all seasons from 1-21 there, mostly at a price of $2/episode or $15/season.
... as far as I can tell all 10 episodes from Season 4 eps are full episodes.