As far as I could read on several militaria forums, the dealer you mentioned on your first message has a not so good reputation. Personally, I have been dealt, without any issues, with the following dealers:
www.emedals.ca (nice source for German Imperial medals, Barry is the owner)
www.germanmilitaria.com
www.weitze.de
www.history-shop.de
www.derritmeister.com (be aware of the prices though)
I'm listing these references based on my personal previous experience. This, however, do not preclude you to do your homework. Hence I strongly suggest you to join some militaria discussion forum in order to know what you're buying. Here are two good boards:
http://www.wehrmacht-awards.com/forums/index.php
http://gmic.co.uk/
Just like Lugers, messed or faked German militaria is all around.
Douglas.