High price of sugar free chocolate

After finding out that Chocology (I frequently walk past their stall at London Bridge Station) has put the price of 85g Cavalier bars of dark chocolate (only 1% sugar) up from £1.99 to £2.49, I decided to do some research on the internet. I quickly found that ordering from goodnessdirect.co.uk (it's okay to click the link, I don't get any commission) saved quite a bit as by buying enough for free delivery the bars came out as £1.42 each, a saving of £1.07!

It seems a little sad that shops like Chocology feel the need to add such a large mark-up on food that is so useful to diabetics.