Definitly don't buy a PP at Tourneau. As far as I know, and as was mentioned above I don't think they are a official dealer. I used to work for a Patek dealer, and can vouch that, that relationship is not only worth it but an important part of the life of the watch.
I think what you are looking for are the deals of day's gone by and they are just that. The far east is such an important part of the luxury market those deals just don't exist anymore. Also, my $.02
Long Train Runnin a Lange is the end game