Ask about getting a rebuilt engine, or even a "used" one from an auto-wreckers.
That can be expensive...but maybe not as much as a used car!

Here is a Germany link for Freecycle: http://www.freecycle.org/display.php?region=Germany

I have seen vehicles available on this site locally. The point is to keep items from going to the landfill. And they are given away!

Try it, and good luck!