Several reward items on the Disney Movie Rewards site are 'on sale' through 8/15 and a few 3D Blu-Rays are included:
450 points - Planes 3D Blu-Ray Combo Pack
800 points - The Good Dinosaur 3D Blu-Ray Combo Pack
1000 points - Chicken Little 3D Blu-Ray Combo Pack
1200 points - The Jungle Book (Live Action) 3D Blu-Ray Combo Pack
1200 points - Inside Out 3D Blu-Ray Combo Pack
I went ahead and grabbed Planes 3D as I already own all of the others.
I actually got Chicken Little and the 2 Pixar films from DMR when they were first available a few years back but I'm pretty sure I had to use at least 2000 points on each movie at the time. Oh well...