Today 11/20/17 only, Zulily has the Melissa & Doug 25 day Countdown to Christmas magnetic Advent Calendar on sale for $11.99.
YMMV $9.99: Once getting to shopping basket, you *may* see a $2 off promo email resubscription offer: "Get $2 OFF this order — turn on zulily promotional emails."
Final price $11.99/$9.99 plus free shipping. After placing this order, you should be able to get free shipping on any other Zulily orders until midnight.
Word of warning: Zulily stuff can take a while to ship. Item page says "Ships within 8-14 days" so you may be a few days into Christmas before this arrives.
We have this Advent Calendar and my kids love it so much they fight over who gets do the ornament each day.
Last popular deal for this a year ago was $12.59 - https://slickdeals.net/e/9384827-melissa-doug-countdown-to-christmas-wooden-advent-calendar-magnetic-tree-12-59-free-store-pickup-or-free-shipping-w-prime?v=1&src=SiteSearch