The price is dependent on the sensor you need and on manufacturer of the sensor. Usually, the sensors are around EUR 150.-, but there are cheaper sensors available (for example temperature sensor, which is about EUR 80.-). Very expensive is, for example, carbon dioxide sensor (about EUR 450,-). Dataloggers (with display) are ca EUR 500.- up to 600.- , but there are alternative and cheaper ways to show the signal from sensors. For the exact price and sensor and datalogger posibilities, contact you MBL reseller.