Keurig K-Duo Essentials Single Serve & Carafe Coffee Maker The Keurig K-Duo Essentials Single Serve & Carafe Coffee Maker ($79, originally $99) offers the best of both worlds. You can fill a mug of coffee for yourself in seconds, or the accompanying 10-cup carafe for a crowd. Image Source: walmart.com Keurig K-Duo Essentials Single Serve & Carafe Coffee Maker $79 from walmart.com Buy Now