In 2004, I was looking for a used (2003) 330i with the performance package, navigation, and mystic blue exterior with black interior. I searched every day for 4 months nationwide.... until one showed up at BMW of Fremont 10 miles away. I bought it that day.
It's a good thing. I just 'obtained' build sheets for all US spec 330i manual transmission cars. As it turns out I own the ONLY car in the US that met the specifications I was searching for. . I always said I would have preferred alcantara interior but I settled for leather. Good thing. There weren't any mystic/alcantara ZHPs w/ nav made in 2003 either.
I may make "rarity" stats publicly available soon. Stay tuned.