I saw a 99RX w/95K miles for 12,500 .. I suggest haggle the price and really review the 3 pages of service ..
full 30k , 60k , 90k service ..
some people (like me) only pay for part of the service. I do most of the maint myself so I know it is done right .. Just because it is a Lexus don't stop going to Toyota .. It is the same engine as the higlander .. and I go to Toyota for parts .. Lexus wants a good 50% for the same parts.
Good luck on your decision