Canadian Tire and UFA still stock Malathion(Walmart did until last year).I have 2 acres to spray,so big jugs(10l) from UFA for me.Get it before they outlaw it too!
The trouble this day and age is that all the "good stuff" has been removed from the shelves. In most cases, one has to ask for Malathion because it is in a back room so to speak.
I don't think a place like HomeDepot/Lowes would have Malathion. A green house or tree farm place would definitely have it.