It's hard to get a lot of the insecticides here in Ontario, the provincial government made it illegal to sell all of them at first, then started loosening the rules a bit at a time. It was supposed to stop use of some of the really scary stuff that some gardeners were dumb enough to use. The pesticides that were getting a lot of people sick, killing all the pollinators like bees. Problem is the importation of those things are controlled by the feds, so people were just buying them in other provinces, or online from the US.
Supposedly as soon as it's shown to be safe the province takes it off the list, and it can be sold again.
I'm pretty sure neem oil is legal to buy. I haven't seen it in any of the stores here, but then I haven't been looking. I just use insecticidal soap for bugs and a potassium bicarbonate spray for mold/fungus.