I found a pack of 5 on Amazon for $20, for each of the sensors and the esp32’s… so $40 for 5. Probably cheaper in Ali or similar. The only negative is they need some calibration. The ones from Adafruit are better quality and already calibrated, but much more expensive.

I have a series of Tasmota esp32’s with Temp/Humidity/Barometric Pressure sensors around the house, attic, garage and outside. I scrape it into influxdb and have a Grafana dashboard setup.