Hi mate,
Linkage is about £40 from VW. Did mine last month.
Have you checked too make sure the wiper isn't going over to far and hitting the rubber on the side of the window. Mine did this. Put the wipers on intermittent and stand outside the car, looking carefully at where they stop before returning, you have to be quick. If it doesn't do it on intermittent try the same on full whack as at speed they travel a little more due to a bit of flex in the arm/blade.
If it is you need to take the wiper arm off and you will see a spline head. Move it back a few notches to stop it going over so far.
HTH Sam