There is no better, fresher, more potent and inexpensive Essiac in the world than that which you have grown and harvested yourself. You can include the Sheep sorrel root in your formula, or even make the tea using 100% sheep sorrel root, as Mali Klein suggests.
The seed kit contains Burdock, Sheep sorrel, Slippery Elm, and Turkey rhubarb seeds, as well as a handy growing guide.
For video on growing the Essiac herbs, go to The Essiac Cafe!
Also, for you Facebook fans, check out the Essiac Growers Guild group, and share your growing experiences :)