 Grocery prices have risen just 1% in the last 12 months after skyrocketing in the two previous years. Economists at Wells Fargo say backyard chefs can whip up a quarter-pound hamburger, complete with lettuce, tomato, and cheese, for just over $2, less than a third of what you might pay at the local drive-thru. Potato salad is also on sale this summer, with potato prices down more than 4% since the last Fourth of July.