Found Disney's 101 and 102 Dalmation boxset in Wednesbury Morrisons for £4 reduced from £19.99. They had about 5 in a basket near the till as they're reducing stock. Not sure if this is nationwide, but worth checking out your local to see what they're reducing there. They had a few other boxsets for £4, I bought the boxset containing the latest Pride and Prejudice, Atonement and Sense and Sensibility.
Worth having a gander at least. Again, apologies if this has already been posted!