I don't buy an advent calendar exactly...I got a cloth one a bunch of years ago that has little pockets where I put the types of chocolates that I like (and also ones my boyfriend likes) so we can countdown with the good stuff!
Of course then we don't get to open the little windows but it's still fun.
I've always wanted one of those large advent calendars like in the movie Christmas Vacation. It's so neat!
Looking forward to Christmas a little early this year.