Saffron--the world's most expensive spice topping off at $3,000/lb according to WSJ. Adulterating saffron was a cause for burning at the stake in medieval times! Must be picked before sunrise! Eat too much and it'll shut down your liver! Lots of other facts in this WSJ article, accompanied by a video of a former Deadhead, who is from Iran, purveying by bicycle the world's best saffron to NYC's finest chefs.
The coop does indeed sell a low-grade saffron, packaged by Roland, hanging in Aisle 2A over the bulk spices.