Yes, you may.
The Present Moment in Minneapolis always has fresh herbs, since is is such a high demand now because of the books selling there like so well. Their tel number is 612-824-3157. They do mail-order and are very quick in sending. Ask for the "Moritz Kidney Tea" and they will know what to send you. Otherwise, www.mountainroseherbs.com ius an excellent source, too, but you will need to select the herbs indvidually.