It's cheaper here, but it wasn't in stock when I wanted to buy
https://www.robotworld.de/hauptbuers...

I bought it here
https://www.ep-mediastore-ab.de/roidmi-eva...

Aliexpress!

As already mentioned Aliexpress or if that takes too long, you will also find what you are looking for on Amazon. Greetings

You will find it by at least Aliexpress. Search for "Roudmi eva brush cover"