Can I get some recommendations on where to buy an android phone?

Edit to add that I read about Geizhals thanks to a previous post and some comments here. Any physical stores I could check?

Will be staying in Wien until January and phone suddenly stopped working. Back home I would just go to a telecom Compay and buy a new one but I'm a bit lost here. Only see a lot of repair shops.

Any recommendations on where to buy a new phone? Where do people usually go for these things?

Are there any discounts like Black Friday or something similar I could take advantage of?

Thanks/Danke