Target have 25% off their blu rays and DVDs starting on Thursday the 10th of January.
Edit: Looks like it is already in place.
As always check JB/Sanity/BigW/Amazon/Zavvi etc.. for the best price.
On page 17 on the workwear catalogue.
Edit: If anyone knows how to get a better link to the deal please let me know. It wants you to enter your postcode first.
Further edit: Changed link to Lasoo