Unfortunately it isn’t limited to supermarkets. Our local green grocer and fruit & vege markets have fruit and vege covered in stickers as well. I believe that if the go through a wholesaler/marketing agent between grower and retailer, stickers are added. Buying direct from the grower (which is impossible for all fruit and vege unless one travels around Australia to local areas where the produce is in season) is unlikely to have labels.
The plastic fruit and vege labels have been covered in other threads, like this one…
