.50¢ Grilled Cheese Sandwich at Sonic on November 15, 2017MomFaveNovember 14, 2017DealsRestaurantsSonic0 Comments 00 min read On November 15, 2017 Sonic is offering their Grilled Cheese sandwich at just .50¢. This deal is good all day, so be sure to stop by and feed the family at a fraction of the typical cost of eating out. Find a location near you. The links in this post may be affiliate links. Read our disclosure policy here.