Can anyone give me a rough guide price
Fans don't work??
Fans will be expensive and you might find that there is a good chance your compressor will have failed also.
Both fans will set you back IRO £900 if suppled and fitted by VW.
I have just replaced my small fan at great cost circa £560
You may find that you can repair these, but if both are gone its a good indication that the larger fan has burnt out as a result for compensating for the failed small fan.
Have you looked at the fans with the engine running and the Air-con switched on? The small fan should kick in, if this fails to happen then the larger fan will tend to over spin to compensate unless off course both have now failed.
Good Luck