We always had an advent calendar growing up and it was on of my favorite traditions. I would love to make one and probably will after the holidays so I have it for next year. But in case I don't make it I will get a handmade one from etsy or an after Christmas sale. Here are the favorites.
Wooden advent calendar with boxes for each day by ScrapColors
Row of Mini mittens from Pearl and Pirate
From Pottery Barn kids this beautiful little house.
This is the kind I would like to make if I have to time. Each pocket holds an ornament that you get out and place on the button covered tree. I love it. Oh and it's felt my new favorite fabric.