CR Kennedy seems to treat us as fools.
They offer us lenses at 20-50% higher prices than overseas and only provide a substandard warranty. Have a look at the fine print on the one year warranty card. There are some lens specific clauses that make my hair stand on end.
When the Australian Dollar was at record highs back in July/August, CR Kennedy supplied Pentax lens prices did not drop. Other brands did.
Now the dollar slides and they waste no time in lifting the prices.
That said, buying from overseas could have its own problems. What if you had quality issues with the lens (DA*16-50 comes to mind). The postage could really add up not to mention GST hassles.
The Tamron version of the 18-250 is still under $600.