I invented the internet. :rofl:
Something you don't see mentioned often is gleaning. If you live in farm country check over fields after the harvest. Most modern machinery leaves large sections of grain or corn standing in corners, along the edges and/or around wet spots in the field. Find out who owns the field and ask permission to glean the leftovers. When I lived in Kansas we often gleaned bushels of corn in an hour or so of picking. You can also get wheat, soybeans or whatever else is available for the labor of harvesting it by hand. It's a good way to get more grain to add to your stores.