maybe i am guessing the ones marco had was only the one side  not the complete unit
i am sure  there isnt any other NOS stock of these complete units , but I am happy to be proven wrong

the last second hand COMPLETE units I saw for sale worked out to be 250.00 , these came from Germany

I can see the sense in the price,If you were to put a cheaper price on a rare specialty item then it would be bought by somebody straight away and not necesarily someone who was going to use it,At least at the price you have set it will be there for the day somebody who really needs one and  wants it,PSP wouldnt be a speciality shop if it didnt have parts like that available.