After breakfast we went to the little wine shop next to the cafe where we bought some Fig Balsamic yesterday and decided to try some more things out.
We ended up buying a little bottle of Riesling Vinegar from http://weingut.goebel-schleyer.com/ and a Riesling bubbly.
The little 200ml bottle cost 5 euro 30 cents, the Riseling bubbly was 9 Euro.