Best Buy has a promotion where they will give you a $5 gift card back when you buy one of 37 select Blu-Ray movies for just $9.99! That's a net cost of just $4.99 per blu-ray!
You can see all of the titles here.
Some of them include:
Monty Python and the Holy Grail
Midnight in Paris
The Social Network
Get your blu-ray for just $4.99 net cost here!