This movie will be available from the WA
Over on the Warner Archive's fb page they have recentally said they have finished remastering this film. So it should be coming to WBshop and Amazon relatively soon as MOD release in the HB Classics Collection.
Know these will only be region 1, as that's all the world seems to get nowadays but for those non Americans and Canadians out there, if you like HB animation, i'd recommend investing in a region 1 dvd player or a region free player, since the vast majority of the library won't probably see the light of day in other regions.
I refuse to argue on IMDB until the general populous actually uses their brains