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You might be surprised to find that shopping carts are often chained up at the store entrance and can only be "freed" by inserting a 1 DM coin into a slot. That's because the carts are very popular 'free furniture': a lot got stolen before this method was introduced. Don't worry, you will get you money back once you chain up the cart again. Also note: nobody will pack your groceries. You need to buy plastic bags and pack your goods yourself.