I am not sure about pricing from Airforms but McFarlane offers an FBO discount which gets the price down to $4671.57 each. For those of us who don't have a machine shop and the requisite skill to make them, paying a good shop to do the work is the option. I have no idea how much that might cost. Might be an easier path, if you need a set, to just buy them.
If you do need a set, at least you can be satisfied with the fact that, barring an accident, the new ones will not need to be replaced again in your lifetime!
Need to go check mine.....
Kevin