Chirag

This is the first time I am buying a new car and it is a lexus rx 350 (2013) and the price that i saw on dealership site is around 48,790... Almost every dealership has the same rate. I have chosen the second package worth $7k. How much I should negotiate? I was thinking more around 45k... does this sound like a fair price? I want to give this as a gift to my wife :)