Buy new Xbox360?

Is there still to buy the Xbox 360 console (not needed, so unfortunately I have often had bad experience)

Mine is now broken after more than 10 years or has been broken: /

Alright, but usually makes no financial sense. Depending on what you want to play, you can also buy an xbox one and play the backwards compatible 360 games on it. You can find lists of compatible games online.

Since I would like to advise you to use silly you want to pay over 300 euro for a 360 because you would be nice but stupid you do not even cost a third

I have over 150 games of which many have not even appeared in Germany. (can also be more did not count them anymore)

New probably only as a remainder, possibly at Gamestop, etc.
Otherwise, have a look at Rebuy.de. They also buy used consoles, test them and sell them with warranty.
Look best after the Slim variant, which were very robust and not as vulnerable as the first models.
https://www.rebuy.de/kaufen/konsolen-und-zubehoer-xbox-360-konsolen?inStock=1