Just been in Sainsburys and saw these were reduced to £10.57, down from £21.47. Not sure they were ever that high a price. They also had spindles of CD-R down to about £7.80 ish. Thought I had captured them in the pic but it was too blurred. Don't know what the quality is like but for backing up non-essential stuff I am going to give them a whirl.
Have tried looking online but can't find them.
Am guessing it is nationwide but can't say for sure.