Amazon has  Wizard of Oz (Two-Disc 70th Anniversary edition for only $4.49!
This is a fantastic price for a classic movie. And, when you make your purchase you can also watch it instantly on your PC, Mac, or compatible device FREE. (Perfect for this rainy day in So Cal!) The 2 disc set features:

Commentary by Historian John Fricke Including Archival Interviews with Cast, Crew and Family
Restoration Featurette
Illustrated Video Storybook
Supporting Cast Profile Roundup
Sing-along Feature
Documentary Profile of Victor Fleming
L. Frank Baum: The Man Behind the Curtain
Hollywood Celebrates it’s Biggest Little Stars!
Dreamer of Oz [1990 TV Special]
Two pre-1939 Wizard of Oz shorts

 

The 2010 Wizard of Oz Two-Disc Special Edition DVD has the sharp 2005 restoration using Warner’s Ultra Resolution process and an accompanying featurette on how it’s done. The technicians also discuss how the sound was remixed, though that would have been more effective had it included surround-sound demonstrations (the featurette is in 2.0). Other features include a commentary track by critic John Fricke supplemented by vintage cast interviews (he offers a lot of trivia, and debunks the myth that Shirley Temple was ever close to getting the Dorothy role); profiles of nine cast members and clips of other movies they appeared in (including Toto); a lightly animated 10-minute storybook narrated by Angela Lansbury; the original mono track and a music-and-effects track; and a sing-along track that you can turn on as you watch the movie or you can select from 10 numbers to sing along with karaoke-style subtitles. The second disc has outtakes and deleted scenes, including Judy Garland’s “Over the Rainbow” reprise and the home-movie recording of “The Jitterbug”; sketches and stills and composer Harold Arlen’s home movies; audio underscores and radio programs; 1979 interviews with Margaret Hamilton, Ray Bolger, and Jack Haley; 2001 and 2005 behind-the-scenes featurettes; a 1950 Lux Radio Theater broadcast; and other items too numerous to mention.