More on the Zissou, here's the official word I received about my inquiry to Adidas' online customer service:

Unfortunately, the Zissou is a "one-off" custom model made especially for that project and it will not be available for sale. The Zissou actually is a version of the ROM, with "zissou" on the side in place of "rom". Here are some specialty dealers who usually carry the ROM:

It goes on to list a number of online retailers who sell the ROM.