I have been using the saline pre-mixed packets for almost a year now. Recently – I have been unable to find the long thing packets that pour easily i

I have been using the saline pre-mixed packets for almost a year now. Recently - I have been unable to find the long thing packets that pour easily into the bottle. I have only been able to find the square packets that work best with the Neti-Pot. Where can I find the long packets? Wal-mart and Wal-greens used to have them - but no longer carry them.