Is that Sydney Australia ??
If so your best bet is probably the wholesale fruit and veg markets, other markets. Dedicated Fruit Shops, if they still exist.
S E Asian / Vietnamese groceries and supermarkets are usually good for fruit from those cultures, but stories can vary a lot.
Organic / Health shops often have some unusual fruit.
Again, for Sydney Australia, check out local blogs and FB pages, might help you narrow it down.