Some things you should know:
1. The Unabomber lived about 50 miles south of the Formulary. I suspect that every chemical company and drug company within about 100 miles was thoroughly investigated by the FBI when he was finally arrested!
2. Shipping overseas is quite different than domestic in terms of cost, customs and regulations. Since Digital Truth is located in the UK, they have different regulations shipping to Commonwealth countries and since they also have a presence in the US, they can ship here freely. The Formulary has no international presence at this time AFAIK.