The bottom line? Soda can nearly always be found cheaper elsewhere. There’s no need to get excited over buying one liter for a dollar when you can score two liters on sale for that same dollar at the supermarket. Just stay tuned into the sales at your favorite grocery store and stock up then for a better value. Tip: Soda is most frequently on sale around big sporting events and long weekends, so keep an eye out for sales during those times.