Definitely worth a visit. Comics und Spiele Baruther Str. Used German games and comics. Impressive supply in a dusty cellar shop- don't be afraid, just dive into it. Also fantasy books in German and English language.
Staff knows what it sells, too.
Probably the best supplier for the LARP addict, and run by such. Everything you need, including beverages like mead. Sorry, have never been in that one. Most of them also also carry a reasonable range of current German games, and sometimes you can find real bargains there. Game Shed Funagain , USA, new and used boardgames The Dragon's Trove Valet d'Coeur , a Games shop and Relais Descartes in Montreal, Canada ADAM spielt , a mail order store in Germany.