I want to buy a Lexus RX350 of 2008 and have no time to shop around. Can anyone recommend a reliable Lexus dealer in southern California--- LA , San Bernardino, Riverside or Orange County, who can offer the best ever known price, and how much?

Longo usually give the best prices on new Lexus, and they have very good service as well. Consumer Reports also has a New Car Buying Service available to everyone, not just subscribers. It's $12 for a report, and it'll tell you the best, "bottom-line" price for any car you're interested in.

use the Consumer Reports service

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