First of all you need to have a realistic overview over the available models and the prices.
Private sellers and car dealers place ads in newspapers and on the internet, I can show you some popular internet sources:
At the following sites you will find thousands of offers and the search engine has sections in many languages. You could try:
(select your language on top of that page and click “search” on the next)
(select your language at the bottom of that page. After that click “used car search”)
If you need some further information on German cars or my assistance, please contact me by email: