Lynn,
I agree with Sidewinder on this one that is where I got mine from 2 years ago! They are in Miami and very fast shipping...
I do however disagree with euro rail hobbies. Just my opinion but I have had bad experiences with them. They really inflate their shipping prices and the biggest concern is their honesty. They list items online as being in stock then when you call they tell you to place the order online. Then once you do that they email you and say its on backorder, after they swipe your card. Backorder on an item like that is garbage! Its not coming any time soon because Faller is not producing that kit right now. No one has them and wont for a while!
Try what Anthony said, look on ebay for a seller that will ship here to the states. The euro is still off some so you will pay for it, but if you want it bad enough that seems to be the only option right now. Here is on that I found when just looking quick. Its got the best offer options so maybe he will come down on it:
Ebay Faller 140428 Salto Mortale