One time I will have to do my first time visit to Musicstore, too, as it's just 90 km /55 miles away...
I just fear it will end up in a higher likelihood of spending a lot of money for something I could do without.
If they turn out to be the only ones in NRW to have the Ketron SD40 ready for testing, I will pay them a visit.
In Dortmund, at least we're lucky to meanwhile have a mid-sized "Justmusic" store (quite a big chain with stores in Berlin, Munich and Hamburg), but they probably won't have an SD40 for testing.