It seems that I see a lot more Radicals overseas but it is also a very popular game in EUR and AUS as well. So, I don't think that fact makes it any easier to find one. I don't think I can justify paying your asking price but I would consider making an offer if I was closer. I mean, I sold a nice EATPM last year for 3K and I think that was a very fair sale price... This game has similar era rules and features and I think it is right up there with one of the better late 80's system 11 games. But once you are asking close to what a used newer Stern costs (Star Trek Pro for 4350), I just don't think the replay value holds up that well. I'd rather pay over 4K for a Whirlwind but I don't really like that game.
There was a decent Radical! that sold a few weeks ago on Pinside for like $1800. It went fast and THAT WAS cheap.
I've been looking for one for a few years but I have zero interest shipping one or driving more than a few hours for one.
With rare exception, I always find the games that I am looking for somehow. This game is no exception. You tend to have a lot more patience once you've been in this hobby for 15 years.