A standard keg contains 15.5 gallons, or 1,984 ounces. A case of Budweiser contains twenty-four 12oz. cans (288 total ounces) and costs about $23. To get the same volume by ounce as a standard keg, you would need to buy seven cases of Budweiser for about $160 – resulting in over $55 in savings per keg.