Help! Where to buy Siemens ST55 from Germany???

Take a look into the sub-board "Achtung Werbung" which is the local advertising board. There you can use the search function ("Suchen") or simply browse through one or two pages. You will find at least two webshops selling the ST55.

I've found two webshops. Here
and Here
Both Shops don't accept payment with credit cards:(
The second one ships in all countrys and the Siemens ST55 seems to be on stock.

Hope it was helpful.