My ice cube trays hold 1 ounce per cube so when adding to recipes it takes just a moment of math to drop the right amount of cubes in.
At first you might forget it's there, even I'm guilty of pouring in water instead of the stock, but soon it will be second nature.
You might think it a small saving when you could purchase a can for $0.50 cents, but this gives you complete control and you know exactly what is in your stock and how fresh it is. Plus it's literally as simple as boiling water. Try it out. I promise your everyday dishes will have a little something extra in flavor and you'll be more satisfied as a result.