Thanks, Elena. I saw their name, but since they were located in the UK, I assumed their policy
would be similar. I've already checked out Johnny's Seeds, Seedsavers Exchange, Swallowtail Seeds,
etc.
I think that if ever a mortal heard the voice of God it would be in a garden at the cool of the day. ~F. Frankfort Moore, A Garden of Peace
Have you checked Outside Pride? Did a quick check and it looks like they have the seeds you want. Have never ordered from them. Park Seed, Swallowtail, and Johnny's all list Eryngium.
Best wishes in your search. Love the colors of the plants you are searching for