Amazon currently have a selection of Disney DVDs on BOGOF. I don't think this promotion is exclusive to Amazon so you can expect to see similar deals from other retailers.
Here's the good bit....They have cross promoted two of these titles in the 4 for 3 deal (Alice in Wonderland - Special edition and the Wild). Buy two copies of each and the deal now becomes buy one get THREE FREE. Four Disney titles for £13.97 Delivered. Please don't abuse.