It might be worth it for you to check out some local 3D printing shops in your city/region. If you can find one, it’s better to get filament through them as they will (most of the time) have tested the filaments. Also it might be cheaper than paying for shipping and faster too.
I know that Colorfabb has a few resellers in Germany: http://colorfabb.com/storelocator/.
But they are more of a premium quality filament provider. Their filaments are superb but a bit pricey.
Also this website might be of use to you: http://3dsuppliers.org/index.php?title=Main_Page.
Finally, try samples before you buy more than 1kg of any filament. Not all PLA/ABS filament is the same, different suppliers use different blends (additives) which may change the quality and behavior of the filament and may not work very well on your printer.