www.modellbahndealer.de
Very wide range of products, unfortunately no pictures, but if You know what You want, You can get it always a little cheaper than elsewhere. The service is also very good, nice people there and if You want something, that is not on the list, they´ll get it for You...
http://www.sgk-modellbau.de
Also a lot of products, but a little more expensive. I use it everytime, the company above can´t get what I want (so not very often).
Hope this helps!
Eric