 But if you went to a moderately priced restaurant, it would cost you $6. Other items for the big feast are also in flux. Potatoes for homemade potato salad, they're down 4% from last year. At the grocery store, potato salad prices have dipped by 7 tenths of 1%. Potato chips are up 2.7%. As far as the prices of drinks go, beer prices are up 1.2% year over year.