I order mine from 1st Chinese Herbs online. I have used both Plum Flower and Nuherb.
These are the sources Buhner recommended. If you have a knowledgeable herbalist in your area, they may know of a good local source. I have not foraged for herbs or processed my own. Would love to have that knowledge and confidence, though.
It's illegal to grow it in the UK due to how it's more or less invulnerable! It's a truly amazing plant. There are many videos on youtube if anyone's interested. Herbalism seems like one of the ways of the future, with regards to medicine, ironic considering they've been around much longer than pharma! For everything, there is a season lol
-Isaiah 54:17 No weapon formed against you shall prosper
-Jeremiah 29:11 I know the plans I have for you, plans to prosper you and not to harm
you, plans to give you hope and a future