Uh, somebody is not meeting their iPhone sales numbers. T-Mobile announced a Spring sale for the Apple iPhone, which features the 8GB iPhone at only 99 Euro (~$155) - The normal price is 399 Euro!

Nothing comes for free of course. You only get the 99 Euro iPhone if you pick the highest plan, which is 89 Euro/month (~$140). Still, for power users, that is the plan you'd want anyway.
With lower plans the iPhone price is also reduced significantely. This dramatic price cuts will surely push lots of consumers over the edge to get their hands on the iPhone in Germany.
The iPhone promotion starts on April 7th and lasts until June 30th.
The 16GB iPhone still sells at the normal price of 499 Euro.

Via this T-Mobile press-release (German).

If AT&T is up for a similar promotion is unkown. Of course such a sale always feeds the hope that Apple will be updating the iPhone to feature 3G soon.