You could have fun buying this...
Located in the 'special purchase' carboard boxes Tesco often have on the end of aisles near the front of the store, it's a zipped laptop 'skin' suitable for up to 15.4" screens made of the usual stretchy neoprene.
The shelf edge ticket suggests a choice of black or blue, but the store I was in only had black. Shelf ticket showed a price of £3 although the swing tag on the product clearly shows it as £2
Predictably, it came up at £3 on the self-scan checkout thus necessitating much touchscreen prodding from the nearest operative to achieve the correct price.
Worth the effort though, cheapest 'skin' I've seen and seems reasonably good quality.