If you aren't happy with the thought of having to buy a cardboard advent calendar each year, you may want to take a look at reusable advent calendars. These durable and attractive calendars, which can be made with fabric or wood, are designed to be used year after year and allow you to fill them with your choice of holiday treats.
Using the same calendar over and over again makes the tradition of counting down the days until Christmas extra special. When they are adults, your children will probably consider the calendar as a family heirloom.
You may want to make hanging the calendar a family event along with setting up the Christmas tree. It will involve more work, but it does create wonderful memories for you and your children to remember.