I’m currently in Poland and looking to buy easily accessible wheat beer (from supermarkets) as it’s my favourite style. All recommendations are welcomed.
Do you mean classic German-style Hefeweizen? If so, try visiting brewpubs, as they usually have the best quality and FRESH weizen. The problem with bottles is that most of them are pasteurized and not very fresh, so the unique character is gone.
In supermarkets you should find Pinta - Bawarka from craft beer scene or from mid-sized breweries you can Amber - Pszeniczniak.
If you are interested in American Wheat, then try Golem - Mazal Adar Dagim. It should be available in Auchan.