Green Mountain dominates the single-serve coffee market with its popular Keurig brewers and K-Cups, the little plastic pods that now come in over 200 licensed varieties. The rise of Keurig has even prompted brands like Starbucks, Folgers, and Dunkin' Donuts to release their own K-Cups, which users insert into the Keurig each time they want a cup of coffee. But other, unlicensed companies have also been able to hop on the bandwagon thanks to crucial patents that expired in 2012. That gave competitors the opportunity to produce generic K-Cups and price them lower than Green Mountain's official line. And consumers have noticed: generic Keurig pods have seen a steady rise in popularity.