Nope, not really. I would recommend you the so called "Retro-Börse". But I doubt you will find a cab there ^^
Next one near Stuttgart is on 22nd of October in the city of Mannheim in case you are interested.
I don't know any retro stuff going on in southern Germany but in Cologne is one shop called "Retrospiel" http://www.retrospiel.com/ which is really nice.
There is the "Giga Center" in Cologne which has some arcade machines (don't expect retro stuff - just some racers and lightgun games available) but is mainly about billard and the typical idiotic Novoline stuff. Area has a lot of drunken scum at weekends so better go early