Where can I get cheap replacement Lexus tyre valves?

I drive a 2003 Lexus 430SC. Recently I had a flat tyre and the local tyre garage found that the tyre valve was leaking. The only people who sell a direct replacement are Lexus, who want £189. Replacement...

Longevity of a door-lock

How long should a rear door lock last with very little use on a 7 year old Lexus LS430? I believe it should be a lot longer than 7 years. Who can I get as an "expert witness" to state that in my claim...