Mr. Coffee makes the cheapest K-cup coffee maker, as of 2015. The Mr. Coffee BVCM-KG2B-001 single serve coffee maker retails on Amazon.com for approximately $54. A similar model by Mr. Coffee sells for roughly $42 on GetKitchen.net.
K-cup coffee makers contain proprietary technology that Keurig developed for its original line of single-serving coffee pod brewers. Breville, Cuisinart and Mr. Coffee are the only other companies that maintain licensing rights in 2015 to manufacture coffee makers using Keurig's K-cup technology.
Of these three manufacturers, the various Mr. Coffee models tend to be the least expensive. Keurig's coffee makers range from $100 to $200. Breville and Cuisinart K-cup coffee makers are in approximately the same price range.