Polish/Eastern European grocery stores

Wondering if anyone has any recommendations for good/well stocked eastern European grocery stores (or stores that sell EE brands), especially Polish.

My local Italian grocer has a limited selection. My partner is Polish and we've just returned from Poland keen to do some traditional cooking, there's also a few brands that hold sentimental value to his family here that we brought back but would love to find supplied locally.

Happy to travel. We imagine we might have more luck somewhere like Glenroy which has a polish community, so would love perspectives from anyone who lives around there.

TIA