Where to buy a second-hand car in Berlin

Hi guys -

I'm thinking about coming up to Berlin and picking up a secondhand car as I understand they are a good bit cheaper than here in Spain. Could anyone recommend some dealers or websites here in Berlin? Thinking along the lines of Alfa, audi, BMW. Any help greatly appreciated!

Autoscout24

Thanks Timmeh - unfortunately my German isn't too good - I gave the site a look but i couldnt search cars by province which dosnt narrow it down to Berlin.

Enter 10001 (Berlin centre postcode) into the bottom right box that says "PLZ" and select the number of KMs radius you want to extend out from there (say 25km for eg) that should cover most of Berlin

Hi Timmeh - I put in the area code like you recommended but got this error: Die angegebene Postleitzahl konnte nicht gefunden werden.
Any further ideas?

Enter a ZIP code that actually exists - like 10117

Berlin post codes ...