5 places
Even if you don't find anything you might want to buy, a visit to the food hall is strongly recommended, it's amazing!
With the member card of Karstadt for free, you get 10 percent discount on the first purchase.
Look online on their own homepage if you can save money by current offers.
Direct access to public transport. If you found nothing, 600 meters away is the Boulevard Berlin, which is a nice shopping mall too.
Expensive department store with an ultra-gourmet food court downstairs. Chancellor Merkel was spotted shopping for dinner ingredients here. Amazing - the large shoe selection on the 1st floor.