This Halloween offer from Wendy’s will leave trick-or-treaters in the cold…really. The burger chain is now offering its annual Halloween Coupon Books. For $1, get a booklet of five coupons — each good for a FREE Jr. Frosty. The coupons are valid from November 1 through February 1, 2016. The best part is that 90-cents of every book sold benefits the Dave Thomas Foundation for Adoption. It might be a good idea for frugal families to consider buying a few for their own use on those days when the kids need an after-school or weekend treat. The coupon books are available at participating locations through October 31, while supplies last.