If you mean Frankfurt, Germany, then:
Fechtsport-Langenkamp
Blumenstrasse 120
Offenbach am Main
http://www.fechtsport-langenkamp.de/html_en/start.htm
The phone numbers are on the website.
Offenbach neighbors Frankfurt and is about a 15-20 minute taxi ride from central Frankfurt. If you plan to visit his shop in person, call first to make sure Herr Langenkamp is in since he also travels around to various competitions to do sales, armouring and other competition services.
I've purchased from Langenkamp both in person and over the web and consider him my favorite fencing supplier. Apparently lots of other foreign fencers like him as well since the last time I was in his shop I saw packages heading out to the US, Japan, Australia and Hong Kong. Now if only the Euro would stop thrashing the $US . . .