Amazon Prime Pantry used to carry a 16-ounce jar of cashew butter for $8.99. The brand is 365, a Whole Foods brand. At $8.99 a jar, you'll have enough to make 16 portions x 1.5 cups water = 24 cups + 2 cups butter = 6-1/2 quarts plus the cost of any sweeteners or extract. If you buy organic, which is what I used, the same size jar costs $16.79 for Once Again brand on Amazon.
https://glutenfreerecipebox.com/easy-homemade-cashew-milk-recipe/