Hi Tony,
In Perth we have only one Lexus dealership for the whole of WA, and they supply an excellent service, hence there is no comparison available with another Lexus dealership in WA. The other option is to service at a Toyota dealership which there are many, I am guessing this could be half the cost. Did you manage to get your prices, my next service is at 35,000kms and I am seriously thinking of getting it done at Toyota if the cost service is 50%. Therefore Lexus $600 versus Toyota $300. I have had the first 3 services for FREE at Lexus (one per year) - this was part of the new car deal package, now I have to pay for forthcoming services.