Saving on Spaghetti and Tomato Sauce

When cooking for two, I find it wasteful to buy certain sizes/products. I have recently started buying a jar of cheap spaghetti sauce and use it most anywhere tomato sauce is called for. I recently used it over stuffed green peppers and use it on my 'fake' pizza. I also sometimes freeze some of it in ice cube trays to have it in small amounts when needed.