We use Colavita extra virgin olive oil, and several varieties of canola oil (President's Choice, Canola Harvest, etc).
For margarine, we use Becel dairy-free/gluten-free.
p.s. don't buy cheap olive oil at the dollar store.. I read some brands are watered down with hazelnut oils, sunflower oils, etc.. always buy a reputable brand (do google searches on "olive oil scandals" for more info)
and if you prefer Italian olive oil, "Imported from Italy" doesn't guarantee it is Italian olives.. cheap olives from other places could be processed in Italy.. it should say "Product of Italy"