Impidimp

The market on this one's quite spread out—20 sellers asking anywhere from £2.56 up to £3.69, with the median sitting at £3.69. The cheapest listing is 31% under that middle ground, so there's real room to shop around if you're buying, though at £3.00 you're already positioned reasonably well.

• NotableUK asks run from £2.56 to a £3.69 median; the cheapest is 31% under the middle.