Money off student stuff 24/7. Buy your NUS extra card - 1, 2 or 3 years available. Buy your NUS extra card now. Enter your email address. Renew your card now. View the profiles of people named Card Mus. Join Facebook to connect with Card Mus and others you may know. Facebook gives people the power to share. Mus is a Spanish card game, widely played in Spain and Hispanic America, and to a lesser extent in France.