This set is part of the Lego Hard to Find collection. Hard to Find sets, generally very sought after by collectors, are produced in limited quantities and are not available at all Lego retailers. 

DISNEY - MICKEY MOUSE & MINNIE MOUSE BUILDABLE CHARACTERS (1739 PIECES) 43179 is categorised BUILDING TOYS / LEGO / HARD TO FIND and sold by l'Imaginaire, a store and specialised website.