Cheaper at Brakes direct .Especially the rears
https://brakesdirect.com.au/aus/catalogsearch/result/?q=vehicle&make=Lexus&model=IS&generation=XE20%2B%282005-2013%29&submodel=IS%2BF
I'm running Falken Azenis FK510 .And love them .very low noise and they grip very well. In the dry and the wet .And were $600 cheaper for a set than the PS4.
I was told from lexus it would be a grand for the key card cut and program and $850 for the fob .I got a brand new fob from the states For $220aus. Sci fleet kedron program it for free and a new Battery too :-)