Max 1000 euros. That is little bit hard to answer.
I guess best bet is follow some bikes on ALDI, ALDI SUD or LIDL assuming you are in germany.
below 1000 euro hard to get a decent e-bike especially in europe where 20% is already a VAT. So try to get something as cheap as possible (most probably all will be something bad quality and breakdown soon).
Second advise now check for some clearance available right now. this can be your best bet to get somethink better.
Molex also have some decent bikes you can check them too.