Given that the micro-USB port seems to have been mandated as a standard for the common External Power Supply in the EU, finding one should not be that big an issue. Looking around here, I have one for a Voyager Pro earpiece, two for Blackberry phones and one that is unknown origin but rated at 2A.
Even Apple is shipping the iPhone 4S in the EU with a Micro USB adapter to allow use of those standard power supplies or you can order one for your older Apple iPhone.
http://store.apple.com/uk/product/MD099ZM/A