UK bought on release day, like GT1. GT3 and GTC were bought well after their release though, I didn't have a PS2 when GT3 came out though and I was tempted to buy GTC but I didn't think it would be worth it so I ended up geting a used copy for £13.
I have the european one. This also reminds of something: I play gt2 on an emu so if anyone wants to exchange replays (replays not garages) talk to me. I´ve been trying for some time but the catch is that it only works on similar versions.