Hello everyone,
I am looking for recommendations for cheap temperature sensors that can be connected to HA.
Either wifi or bluetooth, no zigbee etc.
I don’t have any other demands really except I would prefer them to use “normal” batteries like AA or AAA and not CR2032 etc. as I would like to be able to use rechargeable batteries (better for the environment 
). And they should be cheap as they have limited functionality and I want to spread them around (so ideally maybe 5 € each.
Thank you everyone
Alex