The Last Unicorn is something of a lost classic. I saw it on its original release in 1982, and it had a huge effect on me as a child. It led to a years-long love of fantasy novels, particularly Tolkein and Terry Brooks.
Several years ago, a friend brought it up in conversation, and we decided to try and find it on video. It turned out it had been out of print for quite some time. It’s since been re-released, and it’s seen several versions on DVD, none of which you should consider buying.