Please be gentle with me!!!
Not sure if I would truly call these 'Medium sized' but have seen other posts on here stating that they are. They are the small tray type Selection Boxes with 5 bars of various Cadbury chocolate bars.
The next cheapest price is in fact the Pounland deal which is 3 for £4 but that isn't as cheap as the Home Bargains deal, I just bought 36 of them for a party I'm organising.
Anyway they are 2 for £1.45 in Home Bargains which is equivalent to 72p each.