Small book entitled 'The Natural Prozac Program' for anyone interested in this herb. By Jonathan Zeuss, M.D. 1997 in echange for a couple of small plants.
You might try at the Garden Exchange Forum...For those wishing to trade garden items other than plants and seeds.
I might add though, that much of the country (myself included) cannot do much, if any trading, during the cold winter months.
Here is a link that might be useful: Garden Exchange