Cost of fuel injectors Dacia Duster

Last week while driving the red warning light/beep came on the dash of my Duster (87k on the clock ) and the car became a bit ropey- took it to the garage and diagnosed it as a faulty fuel injector- got that replaced at a cost of €600. Having driven it for 80 km. the same thing happened- red light/ beep took it back to the garage and diagnosed as another injector gone. Had a discussion with the service manager about the possibility of the others going. Decided to get all 3 replaced and was quoted €1500. Does anyone know the ballpark figure for the replacement of 3 injectors, time involved etc? Seems very steep to me

Thanks PB