Various 2 for £20 Blu-rays in my local Asda there were:
Harry Potter And The Prisoner Of Azkabahn
Harry Potter And The Chamber Of Secrets
Rambo: First Blood
Pride and Glory
Chronicles of Riddick
28 Days Later
28 Weeks Later
Men in Black
Most Can Be Got For £10 Alone, But Just Thought It Would Be Helpful, As always varies by store, other Asdas could have better Blus available.
This was in the Fosse Park branch in Leicester.