Loompanics Unlimited, PO Box 1197, P.Townsend, WA 98368. Nurseries and seed companies sell various species. Saliva divonorum is cultivated by the Mazatecs of Oaxaca, Mexico and seems not to grow wild. They use the juice from about 60 leaves. Freshly pickled leaves are probably more potent.
Seeds seem to be readily available.
DO not breath gas directly from a tank as it can freeze your lungs. Alternatively, N2O is present in the bulbs used in whippped cream dispensers. Active compound asarone - a precursor on an hallucinogenic amphetamine. Ibogaine Active constituent of the plant Tabernanthe Iboga, used by African Natives. Kava kava Plant Piper Methysticum extracts have been used in Polynesia for thousands of years, and Piper Plantagiveum is similarly used in Mexico and the Caribbean.