temaki katsuo sheets

Dear Maki,
I'm looking for temaki katsuo sheets after I found some nice recipes in combination with them in Yukiyo Moriyama's "Quick and Easy Sushi Cookbook" (Tokyo 1983). Are they available outside of Japan? A friend of mine is now hunting them in Hongkong, until now without success.
Thanks and congratulations to your great blog! It's really encyclopaedic.