For several months this year there was a Chinese supplier calling himself "Bob" who was offering powdered Nembutal, 25 grams for $850 U.S. dollars if I recall correctly. According to several members here, Bob initially filled orders but eventually turned into a scammer who took people's money without delivering then disappeared altogether.
According to several members Bob's contact info has been deleted from the current November 2019 edition of the PPEH.