Buying: I don't know about local shops an that area, in any case you can order online from macodirect.de or fotoimpex.de. Certain films would be cheaper in the US though, do your research first.
Developing: All drugstores will send your C-41 and E-6 films out to big labs (Fuji and Cewe). Cheap, mostly good, but very rarely I've got scratched film back. They also offer black and white development, but it's more expensive and I don't know what exactly they'll do. Developing yourself could be worth it depending on the volume, buy supplies from the aforementioned online shops. Otherwise there are several pricier labs like photostudio13.de or www.meinfilmlab.de/en/
. I have no experience with them.
Local camera stores might also offer development but many just send out to the same big labs as the drugstores.