They can't be shipped from the US but they can be shipped to the US from Germany, the page clearly says so. The shipping cost depends on the shipping agency. Therefore they say "Please inquire at <email on the page> about shipping and payment options" and list the fixed costs to Germany and Europe where the delivery is fast.
Obviously they saw the increased interest and modified the page. It's more inviting to allow US users not to worry about the possible import taxes. Good move.
They cost 91€ plus shipping, and cannot currently be shipped to the U.S. http://www.digitalsundial.com/ordering.html
They are apparently tuned for a particular latitude, so they won't work in the tropics either...