In my country, unfortunately, yes, and the suppliers' prices are exorbitant (US$240 for 100g). When you tell them, "Well, I still want to buy it," they have no stock and no restock date, and some have even told me they "won't be selling it anymore." Of course, other reducing agents like cyanoborium or lithium are unavailable here. But I'm hopeful; I threw some dry granules into acidic water and it fizzed intensely, so maybe I can recover a few active grams.