I just got back from Wilkinsons in town where I spotted a load of different calendars ranging from 10p to 40p.
A3 sized calendar/planner for 10p
Kitten calendar for 10p
Chocolate calendar for 20p
Shaun the sheep calendar for 30p
There were lots in stock and I grabbed a few of each (well actually about 10 of the 10p ones!).