You can get them
overnighted here. The fruit is, apparently, highly perishable so the best bet might be to grow your own. The FL grower above also has seeds and cuttings available upon request.
Alas, it sounds like the plant does not just row in any old climate. A Japanese researcher GM'd a
product that is more adaptable in its growing conditions. They were able to grow it in a lettuce.
The link above details a Miracle Fruit Cafein an indoor theme park (In Japan, a theme park is liable to break out anytime, anywhere). The cafe specializes in special super-sour baked goods made to be eaten after taking a miraculin tablet.
The linked article in the original post list a couple of business ventures over the decades trying to isolate and popularize the active ingredient. To date, none of these have been successful.
Jazzfood, I would be very interested to see anything you do with this fascinating fruit.