As has been mentioned elsewhere, an official DVD was released May 2013 from the Warner Archive Collection. Its "newly remastered" but not "restored"; luckily the print they've used is in pretty good shape. This is yet another classic that screams for a full HD restoration release on Blu-ray, which could be pretty amazing. Available online from Amazon, and also from wbshop-dot-com
shareI bought the Warner Archive release some time ago. The Technicolor sequences would look much clearer if properly restored. The colour on them is rich and beautiful enough, but tend to be of a slightly lower definition in some shots than in others.
shareWarner Archive trailer and preview: https://www.youtube.com/watch?v=_hEEl9unTNE & https://www.youtube.com/watch?v=GMtZ0hTxJu0
Enormously popular child actress Margaret O'Brien (Meet Me in St. Louis) touches the heart in this classic adventure of a young orphan sent to live at the dark and foreboding English estate of her widowed uncle and his crippled son, played by fellow child sensation Dean Stockwell. Led by a strong will and a stubborn temperament, Mary Lennox (O'Brien) discovers the existence of a secret garden, the history of which slowly reveals the mystery of her uncle and his son's embittered lives. Eventually, the beloved garden becomes the only hope for their happiness and restoration from the haunting grip of the past. Produced by Clarence Brown, the film is based on the popular novel by acclaimed children's author Frances Hodgson Burnett (Little Lord Fauntleroy). A dazzling technical effect aptly derived from The Wizard of Oz brings the secret garden alive in a radiant color sequence, making it, and the film, a magical place you'll have to experience yourself!