I have bought the American grapes and cherries when ours are not in season,and very occasionally I have have bought Kiwi Fruit from ....YES!!!.... New Zealand!!!
But that is it,really! I like to buy Australian whenever possible,and I even try to buy LOCALLY grown if it is at all possible!
I try to buy Australian wherever possible but, like Jules, I do buy the American cherries from time to time. I try extremely hard to buy Australian oranges but my other half brings me Californian ones if he can't find ours. I am ok with NZ produce as my sister lives in NZ and I visit there and see the lovely fresh produce and cow pastures etc.
I buy my fresh fruit and vegetables from the local farmer's market! Occasionally if I don't get time to go to the farmer's market on the weekend to buy my fresh produce, then I will buy fruit and veggies from the supermarket..... but I don't check where it's from.
I find the fruit and veggies from the farmer's market lasts a lot longer!
I don't usually, but if it is necessary to have a healthy diet, I will. It was not that long ago that the banana crops in Queensland were destroyed and there was only imported fruit. When I was a kid, something happened to the orange crop and they had to import Californian oranges or go without them in your diet. I would never be so principalled as to say never. Those who do, must never have shopped at Aldi, where most of the food is imported from overseas, and the profits all go back to Germany.
NEVER -having an orange out of season is not a life or death decision! I try to buy foods which do not have large transport values by buying from farmer's markets and in season fruit and vegetables to keep my footprint as low as possible. Why do those grapes from the U.S.A. keep so long? any body know?