*HURRY!* Milk Coupon: Free Gallon Of Milk When You Buy 3 Breakfast Items – First 10,000 only! This post may contain affiliate links. Please see the full disclosure policy here. Posted on February 27, 2012 Written by Mary Leave a Comment Check out the Milk Mustache Campaign They are currently offering a free Milk Coupon on Facebook. You can grab a FREE Gallon of milk when you purchase THREE breakfast items. Only available for the first 10,000 daily!