That is a big savings. I worked in a bait store for about 3 years. We only sold by the doz. Biggest killer of minnows is lack of oxygen. Bubble boxes at their very best only do a so-so job. In hot weather the air we pump into the water is hot and that heats the water. The warmer the water the less oxygen it holds. Ice in the water will keep it cool but most ice is made from city water that contains chlorine. Deadly! What I do is refill my drinking water or soda bottles with water and freeze it. Squeeze it a little to allow for expansion. I put one of these bottles (with lid still on) into the minnow water. It keeps them cool and don't poison the water. Extra bottles keep my drinks cold and I change out the minnow bottle after about 4 hrs. Just a tip if anyone would like to try it.