AliExpress: 3$
Amazon: 23$
Datasheet: https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf
Bosch code: https://github.com/BoschSensortec/BME280_driver
Sensors test examples:
v1 draft multiple humidity sensors comparision
Test 1 SD Datalog with AHT10 and high humidity
Test 2 v5 board stable environment
Test 5 v5 saturated salt solution
Test 4 v6 Saturated NaCl solution
Test 2 v7 room RH12 low humidity
Test 3 v7 balcony RH15-92 changing humidity
Test 4 v8 RH12 to RH94#BME280vsSHT85SensorsHumidity
Test 1 v8b Balcony high to mid RH
Test 0 v9 balcony high humidity