Shopping in Berlin is a must (as concerts and clubs are, exhibits of all kinds or just plain exploring). But the purse must be prepared for it. Or mustn’t it? A cool Berlin shopping trip does not necessarily mean to be on a diet of water and bread for some months beforehand!
The sacred word is secondhand!!
I find this site extremly handy. You can chose between different categories, which makes it super easy to navigate. There is also an app which you can download if you have a data plan for Germany.