Sonic $1 Popcorn Chicken Jan. 21You’ll love the current Hot Deals, sorry you missed this deal. Celebrate National Popcorn Day with a Snack Size Jumbo Popcorn Chicken for only $1 at Sonic on Tuesday, January 21. This offer is valid all day while supplies last. Don’t forget about 1/2 price drinks everyday from 2-4 PM! Check with your local SONIC Drive-In for participation.