Furbies sold 1.8 million units in 1998 , 14 million units in 1999 , and altogether in its three years of original production , Furby sold over 40 million units , and its speaking capabilities were translated into 24 languages . Furbies sold 1.8 million units in 1998 , 14 million units in 1999 , and altogether in its three years of original production , Furbies sold over 40 million units . Its speaking capabilities were translated into 24 languages .