Wow. Thank you for the useful explanation, you know, I’m not into Lego… no longer, I mean.
Anyway, I might get back into it in a while, because of my little daughter growing.
The best part of the first site you quoted is that it automatically can tell you on which site you can buy, and can calculate for you the price.
I think if something like that existed back then, I’d have been a happier (and poorer) kid.