brewing coffee each morning or simply some caffeine before a full day's work, Keurig single-cup coffee machines are practical and efficient additions to any kitchen, office, or dorm room. It's hard to beat a single-serve brewer, especially when Keurig's best-selling models are on sale. With Amazon's back-to-school sale, now is a great time to score savings on Keurig coffee makers for your daily brews.