Where can you watch sao in German?

I wanted to know where you can still watch sao in German except on netflix because I would like to watch the other seasons as there are only 1 and 2 on netflix.

So far only legal on disc. Alicization has no streaming provider on Dub, only on Sib.

From season 1 to the first part of Alicization on Amazon Prime. War of Alicization: Underworld is not yet available with German synchro.

Ah stupid inserted - Alicization: War of Underworld.

Is it worth buying Alicization completely?

I don't watch SAO, I can't say anything.