Tec80

For the last year I stalked a CPO LS, finally "Seizing the Moment" recently as prices dropped. Obviously lcpo.com is the Lexus CPO search site, but I found that cargurus.com is a more user-friendly way to search for the exact vehicle you want, and it finds the same CPO cars that are listed on the lcpo site.
I also found a glitch in lcpo - if you are looking for an LS600, checking LSh on the main page does not find any. But if you click search without selecting anything, then refine results to LS600h L, up pop all of the 600s nationwide (currently there are 5).