Answer:
In short the answer is Arrowhead Dairy.
Here's Why:
I'm going to convert everything to gallons so we can compare them. I multiply the price along with the volume. So since there are 4 quarts in a gallon I'll do 3.60*4= 14.40. Now I'll do Ben's happy Cows. 2.30*8=18.40 (because there are 18 pints in a gallon)
So now we end up with
19 dollars for Carmela's Creamery, 14.40 dollars for Arrowhead Dairy, and 18.40 dollars for Ben's Happy Cows.