It depends on what you mean by "buy". No, you cannot walk into the store and pick a FA-003 off the shelf. However, there's a few online stores that you can order from and have them shipped to you.
GD Audiobase was (and is) a popular choice, but their shipping can take months due to Russian customs. They have a history of bad customer treatment, but I can assure you that they're taken numerous measures to solve that.
New to the scene of FA imports is Musica Acoustics. They don't yet list the FA-003 on their US site (at least not the last time I checked), but if you e-mail them directly they can send you a pair with no problems at a good price. They're an established business with a great reputation, but shipping could still take a long time because batches from Fischer Audio are intermittent and almost immediately sold out.
Also, ignore the last two posts. They're spam.