Go visit Kitazawa Seed Company:
http://www.kitazawaseed.com
I have been growing Shishito and Fushimi for years and always buy my seed from them. In fact, I buy every seed I can from Kitazawa because the quality is always so good.
Mr. Kitazawa and my father-in-law worked together at the nursery in Oakland in the 1920's.
So sayeth the Vodka Queen