Originally Posted by
etch5895
At German car dealers, is the price on the window the final price, or is it expected to haggle the price down?
It's always expected that the buyer haggles the car down - regardless if it's a new or second-hand car, if you buy at a car dealer or a friend or ...
During final price negotiations for a second-hand car, you could also consider to e.g. get a full car tank.
As the poster above already mentioned, buy by cash is a strong argument during negotiations.