Here is another small hint to make what you buy stretch.
My hubbie loves the chocolate chip muffins from Martha White. I put two in his lunch each day for his morning break.
I've found that I can use less milk and a bit of water to the milk to make the 1/2 cup needed for one package of muffin mix. Since we use 2% milk, it saves on fat and calories. Adding a bit of water cuts down on fat and calories, too.