Don’t Miss $0.50 Grilled Cheese Sandwiches All Day At Sonic! October 12, 2016 by Couponer Post contains sponsored/affiliate links and I get commissions for purchases made from links. Check out this deal at Sonic! Score Grilled Cheese Sandwiches for only $0.50 all day at Sonic! Stop-in for a cheap lunch the kids will love! Just head to the one nearest you and enjoy!