There is no substitute since milk is one of the most nutrient-rich beverages you can buy. Here's a price point comparison, for an 8-ounce serving, to other beverage items, none of which have the same natural, nutrient content as milk:

Milk: $.25

Soda: $.45

Orange Juice: $.62

Bottled Water: $.22

Sports Drinks: $.38-$.75

Energy Drinks: $1.04

Plant based (almond, soy, rice) beverages: $.50