You're not going to have much luck with "online" organic food in Canada. I'll talk about it later, but first I'll talk about shopping yourself.
Bulk Barn actually has a ton of organic grains (eg ORGANIC QUINOA).
Other stores (highly hit and miss) that carry organics are: Sobey's, Loblaws, Costco, and The Real Canadian Superstore.
Just show up and browse the produce. Sometimes you'll find a killer deal on organic grapefruit at one of them, and completely zero organic stock in the other.
Costco carries Earthbound organics salads (large boxes) in their fridge section. The price or less is the same as conventional salad in a regular grocery store.
If you're in Toronto, try also Ambrosia.
On Online delivery
I don't have a good experience with online food delivery. I just don't see a need to pay to get it delivered, when I can easily go out and get it myself. You don't get to choose the fruits you get, and you are going to pay much more.
That said, there's a listing here, and it includes a group called Front Door Organics.
Now I haven't tried them, but browsing their produce, it looks promising. Still,
you're probably not going to have much luck with online services that do delivery, simply because it's too expensive and you don't get much bang for your buck, plus you can't pick the fruits that are in good condition. You're better off going to the store yourself.