If you want to buy european model cheap in price than look at:
--> Modellbahnshop Lippe
see also at:
--> RD Hobby
theyare offering US Model Stuff from different Suppliers and Manufacturers. Recently the RD Shop became a little expensive, it is maybe a trend in offering model railroad stuff higher priced than in directly neighbourhood countries of germany.
If the prices are too high for your wallet, try to importing by your own. Important is that the Sender using the green customs sticker CN22 and not marked as present. The custom fees are not very dramaticly, if you will declare to the customs officers to use the train stuff the following ten years for own use.