[12/14 Update: They just put up Pannepot Grand Reserva, Struise Tsjeeses Reserva, and Alvinne Lexke online!]
Quite interesting! Struise is the one of the first European breweries to sell its beer online and make it available to the U.S. market. While it would be pointless if you are in the States to order a single bottle or two from them, you may actually end up saving money on a case than buying it from a local shipping retailer. That said, I am guessing that most local retailers that ship will cut you a deal if they can and price match what Struise would be offering.
So far they have made available:
Struise Mikkeller
Pannepeut
Pannepot
Struise Rosse