The deal is good at participating locations on single-patty cheeseburgers, while supplies last.
A Sonic Cheeseburger features American cheese, crinkle-cut pickles, chopped onions, shredded lettuce, and sliced tomatoes on a beef patty with your choice of mustard, mayo or ketchup. They normally go for about $3.50 (may vary).
Photo via Sonic.
