Saw these at my local Asda today reduced to £5. Also available online but wouldn't recommend unless you regularly shop at Asda as they dont do click and collect and minimum spend with them online before you can checkout is £25. Otherwise you can pop in store to pick up a Sharpie £5 bargain (whilst stocks last). There was plenty on the shelves at my local.
Sharpie Fine Permanent Markers 18 Pack £5 WAS £15 ASDA
INSTORE AND ONLINE