Add temperature sensor to HA Green

Hi, I’m looking to purchase multiple temperature sensors that I can place around different rooms in my house. Any recommendations to a sensor which is relatively cheap and more importantly, easy to integrate into HA?

I think most temperature sensors come integrated with other stuff, like a hygrometer to measure air moisture and a display and buttons to set a temperature for a thermostat.
These are not really that cheap, but just a temperature sensor is probably too cheap to actually manufacture it.

This might be a good step into ESPHome though and ESPHome will open up your options for other stuff in the future too.

I’m using a few Aqara and Sonoff Temperature/Humidity sensors throughout the property (zigbee type), in addition to the temperatures that I get from my Hue motion sensors (& nest thermostats). Works quite well for my needs. YMMV