(cheap) speakers for mp3 / audio streaming


actually I’m running openhab to control the lights in my house. I added some pir sensors to the rooms in ground floor and these are predestinated to work as alarm equipment.

Of course it would be easy to use a pre-build alarm siren to signal an alarm.
But my idea is to use a speaker that can be controlling via any binding. A siren could be streamed as mp3. The advantage is that the speaker could be used for much more use cases (signalizing other events with tts services and so on).

Now I am searching for cheap speakers that can be used for these use cases.

Are there any experiences and recommondations of (cheap) speakers?

Thanks for your help!