It's somewhat of my tradition to pick up these calendars every year at Thunder Valley, if possible. After spending a total of $3.79* and getting 88 points I got my calendar.
But... it's not as large as the one as I got two years ago, although it's still ok.
2013 Calendar for scale.
*The quickest way of doing this is to keep hitting the max bet button on a 1 cent machine until you reach 88 points. Although any machine will do, the 1 cent has a lower variance if you have a limited amount of money (and the Quick Hit machines allow you to max bet for less). I don't trust table games to accrue points since the number of points seems to vary by a wide margin.