These are those puffy things that look like an oversized cheese curl in the shape of a hollow cylinder, right?
Man, I hate those things...
If you're willing to buy a case or two, you might be able to get your local Japanese market to import it for you. It really depends on whether or not there is an importer/distributor in the US that already carries it.
Or maybe you can try the company itself? It has an english version of its site with a link to ask questions.
Or maybe contact an importer/distributor, such as JFC Foods
and see what they can do.