Check out this thread.
http://us.lexusownersclub.com/forums/index...showtopic=20586
Its a good idea to check it out as it costs you nothing. But, as an FYI, the last list I looked at from my dealer had RX330s excluded from their list because they were selling so well and could not hold on to any. I am expecting to take delivery on my new TC in the next few days.
Do like I did, negotiate a deal and check yourself againsnt the Costco price list, the fleet manager should have the last few months of the price list available for you to check out if he is cool, even if he can't give you a current discount based on that list due to availability.