Do you want tinctures or capsules?
I buy my Cat's Claw and Japanese knotweed capsules from Green Dragon Botanicals:
www.greendragonbotanicals.com/I buy most of my tinctures ( Houttuynia, sida Acuta, Cryptolepis, Hawthorne, etc.) from Woodland Essence:
woodlandessence.com/When Woodland Essence was out of stock for a few things once, I ordered from Sage Woman Herbs:
www.sagewomanherbs.com/They are all recommended by Buhner. I don't find them to be too expensive, especially when starting out and you're not at full dose of each. I live in BC, Canada, and I found the shipping to be quite quick.