Score $0.99 Popcorn Chicken at Sonic Drive-In! Open the Sonic Drive-In app, order a small Popcorn Chicken. Go to your order, click on Rewards and Promo Codes, and enter promo code DELISH to get Popcorn Chicken for $0.99 now through 4/12/20. You can order up to 5 Popcorn Chickens at this low price!