Earlier this week the Disney Store announced their new policy regarding purchasing Frozen merchandise. Included was this:
For the Elsa Costume, opportunity drawings to purchase one costume per Guest will be held on Saturdays. Drawings are determined by individual Store inventory, so please check back here on Fridays for a complete list of participating Stores. At participating locations, Cast Members will be explaining the rules in full detail Saturday mornings, prior to the opportunity drawings. Please note, drawings are conducted by size, and Guests can only enter for one opportunity drawing.
Disney has now released a PDF showing which specific Disney Stores will be holding that opportunity drawing tomorrow on Saturday,May 3rd.