Join Disney Movie Rewards and enter two movie codes (found inside Disney DVD's) before October 31st and you will receive a free Disney Blu-Ray on the anniversary of the month you join. If you join now, you should get a free Blu-Ray this time next year. If you are already a member, login to find out your anniversary month.
They also give you a free Blu-Ray for your birthday. It is worth signing up just for that!