Go here to print coupons for free milk.
Type in the zip code for St. Louis. (63101)
2 milk coupons will show up
One coupon is for a free half gallon of chocolate milk when you purchase a gallon of regular milk and the other is for a free gallon of milk with a $100 grocery purchase.
Although you can only access these coupons for specific zip codes, the coupons don't state that it is only for this limited area. Also the coupons don't state a specific brand of milk so I guess it will work on any of them.