Each year in September, Pepsico produces a seasonal flavor to its Sierra Mist line.  This one is called Cranberry Splash and is simply delicious.  However, as soon as the new year rolls in, it is no longer produced.  It is unique - no one produces a soda with cranberry.  Countless consumers beg them on their Facebook page to produce this wonderful product all year but they simply won't listen.  Maybe the showing of numbers might sway them.