Frosties for a great cause! Each $1 Boo Book has 5 coupons for free junior frosties. The best part? 85¢ of each $1 Boo Books purchase goes to the Dave Thomas Foundation for Adoption to help children waiting in foster care find forever families. You can online or in person through October 31st while supplies last and the free frosty coupons are valid through December 31st, 2020.