I get the feeling it is discontinued, or at least not sold in the US any longer right now. If you Google you should be able to find some online store that still has a few in stock -- that's how I found mine. The bag should last a long time, and I feel fine with not being able to get it again once the bag is used up -- I think it will have served it's purpose without needing to continue supplementing it forever.I've been trying to find it. BRS says that it is discontinued and a couple other online stores. Is it still available?