*HOT* Frozen Olaf Child Halloween Costume $4.97 (Reg $15 + Free Store Pickup October 12, 2015 By: SMFMcomment Tweet WOW!! Only $4.97! Hurry over and get the Frozen Olaf Child Halloween Costume for only $4.97 (reg $15) at Walmart! It includes a tunic and headpiece. Don’t miss out on these great savings plus opt for Free store pickup if available near you.