http://www.the-numbers.com/alltime-bluray-sales-chart
Things to take into consideration
1: aside from beauty and the beast it is the only movie from the 90's on that list in the top 20
2: it hit the dreaded disney vault two years ago i think? For those who dont live in america when disney movies hit the vault production of them is stopped. This is done to keep a movie high in demand, it isnt done for all disney animated films.
So if disney didnt vault it sales would be much higher. Ive learned to hate the vault because it is a really outdated concept
3: this isnt taking into account the digital hd sales.
Im pretty sure that the lion king is the second highest selling vhs with over 30 million copies sold only beaten by the matrix.