Not sure about the 3/4 sections of glass but the 1/4 windows would be about 15 to 25 quid a piece dependant on the condition of the Glass, inner and outer frames.
It will depend on the condition of the frames, the chances are they will be suffering from some rust along the bottom edge, on the other hand if they are dry then take the rubber off (not easy!) and you should get around £40 maybe more