[Update] As has been discussed in the comments of this post CTD-Germany carries most of these same peices at better prices. The good news is I just spoke with someone from CTD and they will ship to the United States and worldwide.
There are tons of new, seemingly well designed MINI mods at Gut-MINI.com. These Japanese parts looks much nicer than many similiar items I've seen on the US or UK market. I'm not entirely sure how one would go about ordering and getting things shipped to the US but I assume it's possible. Of course it's easier if you speak Japanese 🙂