As of March 2015, a good location to purchase Elsa costumes for dress-up is the Disney Store. The Disney Store offers a variety of products from the movie "Frozen."
Items can be purchased either online or in-store. The store finder on the Disney Store website can help users locate the nearest retail location. Customers can opt to sign up for a free newsletter via email to receive upcoming sales and promotions.
Another good location where Elsa costumes can be purchased is Amazon. Disney merchandise can be found by using the search feature on the homepage.
A third location where Elsa costumes can be purchased is Wal-Mart. Some products can be purchased online and picked up in-store.