Just to clear the record, Purina Aqua Max does not derive it's protein from poultry products - rather from menhaden - pure fish protein. I don't know if Bill was intimating this or not - I just thought someone should address it so there's no confusion.
Al uses Cargill, and he likes it. They made a play at the market a while back and even came to PB conference. I have no clue if they are still trying to gain a market share or not, but believe they still produce it. If AM is not available, might be worth investigating Cargill availability.