Amazon offers Prime members Eric Carle's Dream Snow Pop-Up Advent Calendar for $2.74 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $4.98. Barnes & Noble charges the same with in-store pickup, although stock is limited and varies by ZIP code.) That's the lowest total price we could find by $10. This pop-up advent calender is based on Dream Snow by Eric Carle, author of The Very Hungry Caterpillar. It has a very strong possibility of arriving in time for Christmas.