You going to name and shame?
I remember a florist who was selling 6 red roses for £1.50 (yeah, we are talking about 1872 here). They were 40p each or 6 for £1.50. My friend wanted to buy 7, but instead of doing 6 for £1.50 and then the 1 at 40p, the florist charged £2.80, so all 7 at 40p each.