Corn would most likely be the cheapest feed alternative for deer although cheap is not always best. Corn provides a decent amount of carbohydrates and fat but is relatively low in protein and provides little overall nutritional benefit to deer. A better alternative, although more costly, would be to provide a well-formulated, balanced feed that provides protein, minerals and vitamins. A 50/50 mix of feed and corn can be utilized to reduce costs. When feeding corn, we highly recommend using grain that has been properly tested for aflatoxin.
Please be sure and abide by all laws and regulations regarding feeding of wildlife. The growth of the threat of Chronic Wasting Disease (CWD) has prompted several states to outlaw feeding of wildlife.