I was looking at these cases a month ago when they were advertised online at half price in their sale. I ummed and rrrrd and left it. But last week I was in Sainsburys at Durham and saw them for 70% off! I went and bought a set straight away. They cost £27....bargain. They had 4 sets on the shelf when i bought them.
They are hard bodied and have 4 wheels....really smart and easy to manouver.
Dont know if this is nationwide, but online they are back to full price. So you may come across one somewhere.