We're talkin seed here not root eh.
There is a large community of shade growers in the London Ontario area and out in BC, every season it can be found in their local newspapers. They will ship to the States I beleive.
You could try the Wisconson's shade growers community papers or any other large community of growers.
Just a warning though field growers treat their seed with some nasty chemicals and stratifie above ground in a climate and moisture controled enviroment, so they look different than wild sim. seed. They are a light biege colour all over with little variation, sort of a sick guys colour, and smell like a bag of chemicals. They have one or two different grades in size. Why don't you guys go visit a few farms, you will learn alot and see the reason why wild simulated seed jusifiably costs more.
Try to broad cast green seed, that's Mother Natures way eh.
lol; oh yeh don't forget them 165% larger root variant seeds you can harvest if ya throw in some wild seed.
guy