Pre-order The Wizard of Oz, 75th Anniversary Edition [Blu-ray] for only $12.99. It’s regularly $19.98, so you’d save 35% at this price. This will be released October 1, 2013.
Or order the DVD version for only $11.96.
Amazon also has a pre-order price guarantee: Order now and if the Amazon.com price decreases between your order time and the end of the day of the release date, you’ll receive the lowest price.