158XTP: I do NOT know the answer to your question but I indeed do feel bad for the horrific price increases you are experiencing.
You did not touch on the problem we have here in the U.S. of A.
And that problem is "availability"!
I am also puzzled as to the base cause of the excessive cost increases and the availability decreases!
Hoping for better times for you all down under and hereabouts as well.
Hold into the wind
VarmintGuy
