It’s summer now, so most the herbs/plants I’m using are from the garden. I’m trying to be better about drying and storing them for winter use. For plants I wanted but didn’t have, I’ve bought some at local nurseries or ordered seeds online (my last batch came from Seed Geeks on Etsy - they were great!).
In terms of dried herbs/plants, I would first check with a local apothecary or herbalist - they have lots of connections and can get you herbs in small amounts or bulk quantities.
I’d also check your local supermarket - the baking aisle and spice racks are a witch’s wonderland! Lots of great herbs and spices there ready to be used 
Nhaama and Mystique have great suggestions too, and I remember there were a few additional suggestions and links here in this thread: Herbs and where to buy
I hope you’re able to find some suppliers for the herbs you’re looking for, @Cynnie_GC! 
