There's really no quicker way to save money than to stop paying for the labor required to prep food for you.  

If you learn to cook, not only will you save money, but the opposite sex will find you more attractive, your kids may learn what foods other than "brown" taste like, and you'll be able to control the amount of junk that goes into your body instead of guessing at what the local Burger Pasha has decided you should eat.

You need one good chef's knife, a honing steel, a cutting board, a large nonstick skillet, a saucepan, and a big soup-pot to take care of 95% of anything you'd ever want to make.