This past Saturday, 30 January, Disney put Sleeping Beauty "back in the vault", so existing DVDs and Blu-rays (reviewed by me here) will disappear from shelves in the coming months. If you want an example of ultra-widescreen classic animation on Blu-ray, no better one exists than Sleeping Beauty. Amazon is currently listing the Blu-ray at $24.49, so grab it if you want it.
I should also mention that the DVD editions of The Jungle Book, its sequel, and the 101 Dalmations family of movies (animated & live-action) all went back in the vault as well.
The HD Guide's Out of Print Watch is designed to give a head's up to collectors and fans of movies that are going out of print before they're hard to find, over-priced, or both.