I have seen the prices of those german shops and I have to say that they are higher, compared with Italy; two online shops I can recommend in Rome are Cherubini
www.cherubini.com

and Musicarte
www.musicarte.com

Unfortunately, they don't seem to care much for foreign customers, and the proof is that their websites are in italian only, but the prices are really good. I have bought from both of them, especially Cherubini (but my Tyros 2 came from Musicarte, because at the time they had a few in stock).
If you can understand italian, they are worth a look (and a few hundred euros too... )
Just compare the prices...