I'm glad you asked, hope we get an answer. I've also been trying to purchase orris. I believe that several years ago I purchased some from Frontier Herbs, it was thru a catalog. I can't seem to find it in any sort of craft store. I guess it will have to be ordered online.

They have it at www.atlanticspice.com; they do have a minimum 30.00 order, but they have lots of wonderful things-edible spices as well as botanicals. They are a reputable co. w/ good cust. svc. If you don't want to order that much, www.magoomus.com sells smaller quantities.
I know there's others, just drawing a blank right now-I will post them later.

We get it from Nichols Garden Nursery. There's a link below -- from the Online Ordering page, choose Potpourri and then Potpourri Supplies.

We get the powder. Making your own powder from the dried root is an ordeal.

Here is a link that might be useful: Nichols Garden Nursery

I order mine from San Francisco Herb Co., along with a lot of other botanicals, spices and teas. They have a brochure or you can order online.

Gail

I've found it at the local organic foods grocery. It's in with the bulk herbs.