see here). It was one batch that last me 10 months or so (!) It ran out during the holidays and due to laziness or holiday craziness or whatever I relied on a store bought brand until I made time to make more. This time I only had to buy the baking soda and a new bar of pure castile, since I still had plenty of borax and washing soda. There is no cost analysis breakdown for you, so CHEAP will have to suffice. If you want money saving advice, start with your laundry soap. I usually use one or two TBSP per load of this stuff.