You could make your own; there are dozen of ideas on Pinterest. Or simply use an actual calendar like the large desk calendars with space to write in. Every night, write in a new verse reference for you and your family to look up and read together the next day. Or make an Advent paper chain, adding a new link every day with a bible verse or someone to pray for written on the link.
Even Starbucks creates an Advent Calendar. Made of tiny tins holding caramels, it’s really cute too.
You might enjoy my latest book Christmas Seasonings, 101 Quotes and Prayers to Flavor the Holiday. Check it out: