I think this deal may have been posted a month or so ago, but I noticed it last week in M & S Lakeside (Thurrock, Essex) and thought as it was a different location and different films, someone might benefit.
Most Blu-rays were marked up as £15 but went through the till at 2 for £10. Picked up The Kingdom and Surfs Up myself.
Last weekend they had -
My Best Friends Wedding
Burn After Reading