Target, of all places. They had 2 left at the Orlando, FL store when I was there. That's far and away the cheapest price I have ever seen, considering the 39.99 MSRP.
Costco had them for $24.99 when they were first released. That's where I got mine.
Target also has some good prices on Disney titles if anyone is looking for them. I just picked up "Dumbo" for $19.99, also saw a bunch of other titles that are regularly $22.99 at Best Buy (like "The Black Cauldron" which I bought a few weeks ago at BB ).