The Easiest and Most Complicated Coffee Brewing Gadgets The retail value of the U.S. coffee market is $30-32 billion, according to the Specialty Coffee Assoc. of America, with specialty coffees comprising 50 percent. To brew the coffee of your choice, households and businesses can choose from a range of devices. The Piamo single serve espresso maker for microwaves, called the world's smallest coffee machine, brews in 30 seconds and costs about $53. Piamo