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.
Comblab project finished in December 2014. In this website you can download Comblab teaching materials ready to be used in several languages. Currently most Comblab partners go on working with MBL for secondary science.