Now I have found another interesting looking place which have similar products sometimes even cheaper prices. Bang Good at http://www.banggood.com/ has a lot of similar stuff like Dealextreme. They have a lot of Arduino stuff at cheap prices. For example Arduino Nano, Arduino Mega, Ethernet Shield and many sensors seem to be very cheap. Hopefully they have reliable delivery that is not too slow. I did a small test order to see how things work with this shop.