Buy any eligible title in the list below between August 31, 2012 and October 14, 2012 and receive a reward code which you can redeem for a certificate valid for one admission (up to $12 value) to see Finding Nemo 3D beginning September 14, 2012 at participating theaters.
The prices aren't the greatest (surprised?), but when you factor in a free movie ticket valued up to $12, it makes the purchase more palatable.

Plus, since this is a separate promotion from DMR's, you can DOUBLE the number of free movie tickets by stacking both promos with a qualifying movie. See links for more details.

Amazon

DMR