Do some googleing and compare prices. Think about transportation costs. Your local feed store will have corn and wheat that could be cooked whole or made into hominy, or used more traditionally if you have a grain mill. Ask when you buy to make sure no pesticides have been added, what is fit for livestock will probably be OK for human consumption. Think about storeage. For long term storeage you need to keep most stuff cool and dry.
As you are bumping around the internet you will run into Morman sites. They are good sources of information as they have been storing essentials for a long time.
