Lots of good posted ideas here! I became disabled in April and receive a very, very, very small amount of food stamp help. I use that for fresh fruits, fresh veggies, butter, milk and eggs. I get basic staples, soups, etc from my local food bank. At first I was ashamed to have to receive the stamps and go to the food bank but those things exist to help people so, depending on what and how much you need to eat to remain 'healthy', don't rule out the food bank if need be.
And as other posters mentioned if you could tell us what kind of foods you like it would be easier for us to share low cost recipes with you ;-)