 As far as drinks go, plastic bottles are less expensive than those in aluminum cans. Plastic liter bottle drinks are down more than 6%. Dan Roland for CBS News, Washington. And while we're on the subject of food prices, a new report by the e-commerce platform Store Connect finds 58% of consumers have put off important expenditures in order to buy food over the last six months. 67% have put off medical expenses. 57% have delayed child care.