When I was working in the restaurant, there was one year that the iceberg lettuce crop was severely damaged (I think from cold, but I don't remember) the price of iceberg shot through the roof, and suddenly it was a delicacy being served by high end restaurants. They would literally serve a quarter head of iceberg with some blue cheese dressing as an appetizer for like 15 bucks. Once the price dropped again, it went back to being a "cheap food" for diners.