For anyone on a mission to find the impossible (at least within the US), I also recommend Urnäscher Brauchtumskäse, 12 month-Aged Pecorino Pepato, Fromage Mauerhofer, and Piora
AND…
IF you are in the Basque region and so happen to find yourself in Biarritz (one of the best places on Earth), do stop by 1001 Fromages, the ultimate Cheese Nirvana.